Touch display device and touch sensing method

Abstract

The invention relates to a touch display device and a touch sensing method. A touch display device according to an exemplary embodiment of the present disclosure may include a first touch sensor disposed in a transparent area, a first touch line electrically connected to the first touch sensor and extending in a column direction, a first touch bridge electrically connected to the first touch line and extending in a row direction, and a second touch bridge electrically connected to the second touch line and extending in a row direction. And a first sub-touch bridge electrically connected to the first touch bridge and the first touch sensor, extending in the column direction, and not overlapping the first touch sensor.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a touch display device, and more particularly, to a touch display device capable of eliminating ghost touch, for example but not limited to. Background Art

[0002] Recently, there is a touch display device that provides a touch-based input method that allows a user to input information or commands intuitively and conveniently, evolving from conventional input methods such as buttons, keyboards, and mice.

[0003] The description provided in the discussion of related art section should not be considered as prior art simply because it is mentioned in or related to this section. The discussion of related art section may include information describing one or more aspects of the subject technology, and the descriptions in this section do not limit the present invention. Summary of the invention

[0004] Therefore, the inventors of the present disclosure have recognized that, in the case of a self-luminous display, if a touch sensor is built into a display panel, the presence of surrounding electrical patterns such as display-related electrodes or lines on the display panel may increase parasitic capacitance, thereby causing a problem of reduced touch sensitivity. In addition, there is a problem of reduced touch sensitivity due to changes in parasitic capacitance caused by unknown phenomena.

[0005] Exemplary embodiments of the present disclosure may provide a touch display device having a touch bridge structure capable of preventing a decrease in transmittance.

[0006] Exemplary embodiments of the present disclosure may provide a touch display device having a touch bridge structure capable of reducing display-to-touch crosstalk (DTX).

[0007] Exemplary embodiments of the present disclosure may provide a touch display device having a touch sensor structure capable of reducing parasitic capacitance and load.

[0008] Exemplary embodiments of the present disclosure may provide a touch display device capable of eliminating ghost touches.

[0009] Exemplary embodiments of the present disclosure may provide a touch display device in which a temperature sensor structure is combined with a touch sensor structure.

[0010] Exemplary embodiments of the present disclosure may provide a touch display device capable of compensating a touch sensing value by sensing a current reflecting a temperature.

[0011] A touch display device according to an exemplary embodiment of the present disclosure may include: a first sub-pixel, the first sub-pixel having a first light-emitting device and a first scanning transistor; a first touch sensor, the first touch sensor being adjacent to the first sub-pixel in a row direction; a first touch line, the first touch line being electrically connected to the first touch sensor and extending in a column direction; a first sensing line, the first sensing line being arranged to be adjacent to the first touch line and extending in the column direction; a first sensing transistor, the first sensing transistor controlling the electrical connection between the first sensing line and the first touch sensor; a first touch bridge, the first touch bridge being electrically connected to the first touch line and extending in the row direction; and a first sub-touch bridge, the first sub-touch bridge being electrically connected to the first touch bridge and the first touch sensor, extending in the column direction, and arranged between the first sub-pixel and the first touch sensor.

[0012] In the touch display device according to the exemplary embodiment of the present disclosure, the first sub touch bridge may be disposed not to overlap the first touch sensor.

[0013] A touch display device according to an exemplary embodiment of the present disclosure may include a first touch sensor arranged in a transparent area, a first touch line electrically connected to the first touch sensor and extending in a column direction, a first touch bridge electrically connected to the first touch line and extending in a row direction, and a first sub-touch bridge electrically connected to the first touch bridge and the first touch sensor, extending in the column direction and not overlapping with the first touch sensor.

[0014] A touch sensing method according to an exemplary embodiment of the present disclosure may include: a temperature sensing step for sensing the temperature of an area of ​​a first touch sensor during a display period to obtain a temperature sensing value, or sensing a current passing through the first touch sensor to obtain a current sensing value as a temperature sensing value; a touch sensing step for acquiring a first touch sensing value through the first touch sensor during a touch period; a temperature compensation step for creating a second touch sensing value by changing the first touch sensing value based on the temperature sensing value; and a touch occurrence or touch position determination step for determining a touch occurrence or touch position based on the second touch sensing value.

[0015] According to an exemplary embodiment of the present disclosure, a touch display device having a touch bridge structure capable of preventing a decrease in transmittance may be provided.

[0016] According to an exemplary embodiment of the present disclosure, a touch display device having a touch bridge structure capable of reducing display-to-touch crosstalk (DTX) may be provided.

[0017] According to exemplary embodiments of the present disclosure, a touch display device having a touch sensor structure capable of reducing parasitic capacitance and load may be provided.

[0018] According to an exemplary embodiment of the present disclosure, a touch display device capable of eliminating a ghost touch may be provided.

[0019] According to an exemplary embodiment of the present disclosure, a touch display device in which a temperature sensor structure is combined with a touch sensor structure may be provided.

[0020] According to an exemplary embodiment of the present disclosure, a touch display device capable of compensating a touch sensing value by sensing a current reflecting a temperature may be provided.

[0021] According to an exemplary embodiment of the present disclosure, a touch display device having a dummy touch bridge structure capable of preventing a specific area (eg, a specific horizontal area) within a screen from looking strange may be provided.

[0022] According to the exemplary embodiments of the present disclosure, a lightweight touch display device having a simple and easily manufactured touch sensor structure may be provided.

[0023] The effects according to the present disclosure are not limited to the above-exemplified contents, and more various effects are also included in the present disclosure.

[0024] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the inventive concept as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a system configuration diagram of a display device according to an exemplary embodiment of the present disclosure.

[0027] Figure 2 A schematic structure of a display panel of a touch display device according to an exemplary embodiment of the present disclosure is shown.

[0028] Figure 3 A touch sensing system of a touch display device according to an exemplary embodiment of the present disclosure is briefly illustrated.

[0029] Figure 4 A touch driving circuit of a touch display device according to an exemplary embodiment of the present disclosure is shown.

[0030] Figure 5is a diagram for explaining a change in touch sensitivity when thermal drift occurs due to a touch pointer in a touch display device according to an exemplary embodiment of the present disclosure.

[0031] Fig. 6A is a diagram for explaining a change in touch sensitivity caused by a finger touch in a touch display device according to an exemplary embodiment of the present disclosure.

[0032] Figure 6B is a diagram for explaining a change in touch sensitivity according to an image change in a touch display device according to an exemplary embodiment of the present disclosure.

[0033] Figure 7 A touch sensor configuration for compensating for a change in touch sensitivity according to a temperature change of a display panel in a touch display device according to an exemplary embodiment of the present disclosure is shown.

[0034] Figure 8 Shown in more detail Figure 7 A first touch sensor unit area.

[0035] Fig. 9 A driving timing of a touch display device according to an exemplary embodiment of the present disclosure is shown.

[0036] Fig.10 A first touch sensor unit area during a display period in which temperature sensing is performed in a touch display device according to an exemplary embodiment of the present disclosure is illustrated.

[0037] Fig.11 A first touch sensor unit area during a touch period in a touch display device according to an exemplary embodiment of the present disclosure is illustrated.

[0038] Fig.12 Two touch sensor unit areas during a display period in which temperature sensing is performed in a touch display device according to an exemplary embodiment of the present disclosure are illustrated.

[0039] Fig.13 A structure for simultaneously performing temperature sensing for a plurality of touch sensors in a touch display device according to an exemplary embodiment of the present disclosure is shown.

[0040] Fig.14 A compensation process for a touch sensitivity change due to a temperature change in a touch display device according to an exemplary embodiment of the present disclosure is illustrated.

[0041] Fig.15 is a flowchart of a touch sensing method in a touch display device according to an exemplary embodiment of the present disclosure.

[0042] Fig.16A is a touch sensitivity curve graph for explaining a compensation process of a touch sensitivity change according to a temperature change caused by a finger touch of a touch display device according to an exemplary embodiment of the present disclosure.

[0043] Fig. 16B is a touch sensitivity curve graph for explaining a compensation process of a touch sensitivity change according to a temperature change caused by an image change of a touch display device according to an exemplary embodiment of the present disclosure.

[0044] Fig.17 is a schematic diagram showing a touch sensor structure of a touch display device according to an exemplary embodiment of the present disclosure.

[0045] Fig.18 A touch sensor unit region of a touch display device according to an exemplary embodiment of the present disclosure is shown.

[0046] Fig.19 and Fig. 20 is a cross-sectional view of a touch display device according to an exemplary embodiment of the present disclosure.

[0047] Fig.21 Two touch sensor unit areas of a touch display device according to an exemplary embodiment of the present disclosure are shown.

[0048] Fig. 22 Driving synchronization between the first sub touch bridge and the first touch sensor is shown.

[0049] Fig.23 is a schematic diagram showing a first touch electrode unit area to which a plurality of sub-touch bridges are applied.

[0050] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals should be understood to refer to the same elements, features, and structures. The sizes, lengths, and thicknesses of layers, regions, and elements and their depictions may be exaggerated for purposes of clarity, illustration, and convenience. DETAILED DESCRIPTION

[0051] Reference will now be made in detail to embodiments of the present disclosure, examples of which may be illustrated in the accompanying drawings. The described progression of processing steps and / or operations is an example; however, the order of steps and / or operations is not limited to the order set forth herein, but may be modified as known in the art, except for steps and / or operations that must occur in a particular order. The names of various elements used in the following description may be selected only for convenience in writing the specification and may therefore differ from the names used in the actual product.

[0052] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. When assigning reference numerals to the components of each drawing, the same reference numerals may be assigned to the same components, even if they are shown in different drawings. When it is determined that the subject matter of the present disclosure is unclear, the details of known technologies or functions may be skipped. As used herein, when a component "includes" another component, "has" another component, or "is composed of" another component, the component may add other components, unless the component "only" includes another component, has another component, or is composed of another component. As used herein, the singular forms "one", "an", and "the / said" are intended to also include plural forms, unless the context clearly indicates otherwise.

[0053] Expressions such as "first", "second", "A", "B", "(a)", and "(b)" may be used to describe components of the present disclosure. These expressions are provided only to distinguish a component from another component, and the nature, order, or number of the components is not limited by these expressions.

[0054] When describing the positional relationship between components, when two or more components are described as being “connected,” “coupled,” or “linked,” the two or more components may be directly “connected,” “coupled,” or “linked,” or another component may intervene. Here, other components may be included in one or more of the two or more components that are “connected,” “coupled,” or “linked” to each other.

[0055] When using terms such as "after", "next" and "before" to describe the time flow relationship related to components, operating methods and manufacturing methods, unless the term "immediately" or "directly" is used, it may include non-continuous relationships and may also include discontinuous situations.

[0056] When a component is assigned a value or its corresponding information (eg, a level), the value or the corresponding information may be interpreted as including tolerances that may arise due to various factors (eg, process factors, internal or external influences, or noise).

[0057] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the example embodiments belong. It should also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having, for example, a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein. For example, the term "component" or "unit" may apply to, for example, a separate circuit or structure, an integrated circuit, a computing block of a circuit device, or any structure configured to perform the described function as would be understood by a person of ordinary skill in the art.

[0058] Furthermore, when any dimension, relative size, etc. is mentioned, it should be considered that the numerical value or corresponding information (such as level, range, etc.) of the element or feature includes a tolerance or error range that may be caused by various factors (such as process factors, internal or external influences, noise, etc.), even if no relevant description is specified. In addition, the term "may" fully includes all meanings of the term "can".

[0059] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. For ease of description, the scale of each element shown in the drawings is different from the actual scale, and is therefore not limited to the scale shown in the drawings.

[0060] Hereinafter, various embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0061] Figure 1 is a system configuration diagram of a display device 100 according to an exemplary embodiment of the present disclosure.

[0062] Reference Figure 1 , the touch display device 100 according to an exemplary embodiment of the present disclosure may include a display panel 110 and a display driving circuit as components for displaying an image.

[0063] The display driving circuit may be a circuit for driving the display panel 110 , and may include a data driving circuit 120 , a gate driving circuit 130 , and may further include a display controller 140 that controls the data driving circuit 120 and the gate driving circuit 130 , and the like.

[0064] The display panel 110 may include a display area DA that displays an image and a non-display area NDA that does not display an image. The non-display area NDA may be an outer area of ​​the display area DA and may also be referred to as a frame area or an edge area. All or part of the non-display area NDA may be an area visible from the front of the touch display device 100, or may be an area that is curved and not visible from the front of the touch display device 100.

[0065] The display panel 110 may include a plurality of sub-pixels SP for displaying an image and various types of signal lines for driving the plurality of sub-pixels SP.

[0066] The touch display device 100 according to the exemplary embodiment of the present disclosure may be a liquid crystal display device, or may be a self-luminous display device in which the display panel 110 emits light itself. If the touch display device 100 according to the exemplary embodiment of the present disclosure is a self-luminous display device, each of the plurality of sub-pixels SP may include a light emitting device.

[0067] For example, the touch display device 100 according to the exemplary embodiment of the present disclosure may be an organic light-emitting display device, in which the light-emitting device is implemented as an organic light-emitting diode (OLED). For another example, the touch display device 100 according to the exemplary embodiment of the present disclosure may be an inorganic light-emitting display device, in which the light-emitting device is implemented as an inorganic-based light-emitting diode. For another example, the touch display device 100 according to the exemplary embodiment of the present disclosure may be a quantum dot display device in which the light-emitting device is implemented as a quantum dot, which is a semiconductor crystal that emits light by itself. However, the present disclosure is not limited thereto.

[0068] The structure of each of the plurality of sub-pixels SP may be changed according to the type of the touch display device 100. For example, if the touch display device 100 is a self-luminous display device in which the sub-pixel SP emits light by itself, each sub-pixel SP may include a light-emitting device capable of emitting light by itself, one or more transistors including a driving transistor and a switching transistor, and one or more capacitors, but is not limited thereto. As an example, one or more additional components may also be included.

[0069] For example, the various types of signal lines may include a plurality of data lines DL for transmitting data signals (also referred to as data voltages or image signals) and a plurality of gate lines GL for transmitting gate signals (also referred to as scan signals), but are not limited thereto. As an example, one or more additional signal lines (such as power lines, light emission control lines, sensing lines, etc.) may also be included.

[0070] The plurality of data lines DL and the plurality of gate lines GL may cross each other. Each of the plurality of data lines DL may be arranged while extending in the first direction. Each of the plurality of gate lines GL may be arranged while extending in the second direction.

[0071] Here, the first direction may be a column direction, and the second direction may be a row direction. Alternatively, the first direction may be a row direction, and the second direction may be a column direction.

[0072] The data driving circuit 120 is a circuit for driving a plurality of data lines DL, and can output data signals to the plurality of data lines DL. For example, the data driving circuit 120 outputs data voltages through the plurality of data lines DL. The gate driving circuit 130 is a circuit for driving a plurality of gate lines GL, and can output gate signals to the plurality of gate lines GL. For example, the gate driving circuit 130 outputs scan signals to sub-pixels through the plurality of gate lines GL. The display controller 140 is a device for controlling the data driving circuit 120 and the gate driving circuit 130, and can control the driving timing of the plurality of data lines DL and the driving timing of the plurality of gate lines GL.

[0073] The display controller 140 may provide a data driving control signal to the data driving circuit 120 to control the data driving circuit 120 , and may provide a gate driving control signal to the gate driving circuit 130 to control the gate driving circuit 130 .

[0074] The data driving circuit 120 may provide data signals to the plurality of data lines DL according to the driving timing control of the display controller 140. The data driving circuit 120 may receive image data in a digital form from the display controller 140, convert the received image data into a data signal in an analog form, and output the converted image data to the plurality of data lines DL, thereby driving the plurality of data lines DL.

[0075] The gate driving circuit 130 may provide a gate signal to the plurality of gate lines GL according to the timing control of the display controller 140. The gate driving circuit 130 may receive a first gate voltage corresponding to an on-level voltage and a second gate voltage corresponding to an off-level voltage and various gate driving control signals (e.g., a start signal, a reset signal, etc.), generate a gate signal, and provide the generated gate signal to the plurality of gate lines GL.

[0076] For example, the data driving circuit 120 may be connected to the display panel 110 by a tape automated bonding (TAB) method, or may be connected to a bonding pad of the display panel 110 by a chip on glass (COG) or chip on board (COP) method, or may be connected to the display panel 110 by being implemented as a chip on film (COF) method, but is not limited thereto.

[0077] The gate drive circuit 130 may be connected to the display panel 110 using a tape automated bonding (TAB) method, or may be connected to a bonding pad of the display panel 110 using a chip on glass (COG) or chip on board (COP) method, or may be connected to the display panel 110 according to a chip on film (COF) method. Alternatively, the gate drive circuit 130 may be a gate-in-panel (GIP) type, and may be formed in the non-display area NDA of the display panel 110. For example, the gate drive circuit 130 may be embedded in the non-display area NDA of the display panel 110 in the form of a gate-in-panel (GIP) type formed together with a thin film transistor of the display area DA, but is not limited thereto. The gate drive circuit 130 may be disposed on or connected to the substrate SUB. That is, if the gate drive circuit 130 is a GIP type, the gate drive circuit 130 may be disposed in the non-display area NDA of the substrate SUB, but is not limited thereto. The gate driving circuit 130 may be connected to the substrate in the case of a chip on glass (COG) type, a chip on film (COF) type, or the like.

[0078] In addition, at least one of the data driving circuit 120 and the gate driving circuit 130 may be disposed in the display area DA of the display panel 110, but is not limited thereto. For example, at least one of the data driving circuit 120 and the gate driving circuit 130 may be disposed so as not to overlap with the sub-pixel SP, or may be disposed so as to partially or completely overlap with the sub-pixel SP.

[0079] The data driving circuit 120 may be connected to one side (e.g., the upper side or the lower side) of the display panel 110. Depending on a driving method, a panel design method, etc., the data driving circuit 120 may be connected to both sides (e.g., the upper side and the lower side) of the display panel 110, or may be connected to two or more sides among four sides of the display panel 110, but is not limited thereto.

[0080] The gate driving circuit 130 may be connected to one side (e.g., the left side or the right side) of the display panel 110. Depending on a driving method, a panel design method, etc., the gate driving circuit 130 may be connected to both sides (e.g., the left side and the right side) of the display panel 110, or may be connected to two or more sides of four sides of the display panel 110, but is not limited thereto.

[0081] The display controller 140 may be implemented as a separate component from the data driving circuit 120 , or may be implemented as an integrated circuit integrated with the data driving circuit 120 .

[0082] The display controller 140 may be a timing controller used in typical display technologies, or may be a control device that can further perform other control functions including a timing controller, or may be a control device different from a timing controller, or may be a control device other than a timing controller, or may be a circuit within a control device. In an exemplary embodiment, the gate drive circuit 130 (for example, embedded in the display panel 110) may receive a plurality of gate control signals from the display controller 140. In addition, the data drive circuit 120 may receive a plurality of data control signals from the display controller 140. The display controller 140 may be implemented with various circuits or electronic components such as an integrated circuit (IC), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a processor.

[0083] The display controller 140 may be mounted on a printed circuit board, a flexible printed circuit, etc., and may be electrically connected to the data driving circuit 120 and the gate driving circuit 130 through the printed circuit board, the flexible printed circuit, but is not limited thereto.

[0084] The display controller 140 may send and receive signals with the data driving circuit 120 according to one or more predetermined interfaces. For example, the interface may include a low voltage differential signal (LVDS) interface, an embedded clock point-to-point interface (EPI) interface, or a serial peripheral interface (SPI), but is not limited thereto. In addition, the display controller 140 may send and receive signals with the gate driving circuit 130.

[0085] In order to provide a touch sensing function in addition to an image display function, the touch display device 100 according to an exemplary embodiment of the present disclosure may further include a touch panel and a touch sensing circuit 150, and the touch sensing circuit 150 senses the touch panel to detect whether a touch object such as a finger or a pen has been touched, or detects a touch position. The embodiment is not limited thereto. For example, the touch panel and the touch sensing circuit 150 may be omitted according to the design.

[0086] The touch sensing circuit 150 may include a touch driving circuit 160 for driving and sensing the touch panel to generate and output touch sensing data, and a touch controller 170 for detecting a touch occurrence or detecting a touch position using the touch sensing data.

[0087] The touch panel may include a plurality of touch electrodes as touch sensors. The touch panel may also include a plurality of touch lines for electrically connecting the plurality of touch electrodes and the touch driving circuit 160. The touch panel or the touch electrodes may also be referred to as touch sensors.

[0088] The touch panel may be located outside the display panel 110 or inside the display panel 110. If the touch panel is located outside the display panel 110, the touch panel is referred to as an external type. If the touch panel is an external type, the touch panel and the display panel 110 may be manufactured separately and combined during the assembly process. The external type touch panel may include a substrate and a plurality of touch electrodes located on the substrate. The external type touch panel may also include a plurality of touch lines. The plurality of touch lines may be connected to the plurality of touch electrodes, respectively. If the touch panel is located inside the display panel 110, the touch panel is referred to as an internal type. If the touch panel is an internal type, the touch panel may be formed inside the display panel 110 during the manufacturing process of the display panel 110.

[0089] The touch driving circuit 160 may provide a touch driving signal to at least one touch electrode among the plurality of touch electrodes, and sense at least one touch electrode among the plurality of touch electrodes to generate touch sensing data.

[0090] The touch sensing circuit 150 may perform touch sensing in a self-capacitance sensing manner or a mutual capacitance sensing manner.

[0091] When the touch sensing circuit 150 performs touch sensing in a self-capacitance sensing manner, the touch sensing circuit 150 may perform touch sensing based on the capacitance between each touch electrode and a touch object (eg, a finger, a pen, etc.).

[0092] According to the self-capacitance sensing method, each of the multiple touch electrodes can be used as a driving touch electrode and can also be used as a sensing touch electrode. The touch driving circuit 160 can drive all or part of the multiple touch electrodes and sense all or part of the multiple touch electrodes.

[0093] When the touch sensing circuit 150 performs touch sensing using a mutual capacitance sensing method, the touch sensing circuit 150 may perform touch sensing based on capacitance between touch electrodes.

[0094] According to the mutual capacitance sensing method, the plurality of touch electrodes may be divided into driving touch electrodes and sensing touch electrodes. The touch driving circuit 160 may drive the driving touch electrodes and sense the sensing touch electrodes.

[0095] As described above, the touch sensing circuit 150 may perform touch sensing in a self-capacitance sensing manner and / or a mutual capacitance sensing manner. However, hereinafter, for ease of explanation, it is assumed that the touch sensing circuit 150 performs touch sensing in a self-capacitance sensing manner, but is not limited thereto.

[0096] The touch driving circuit 160 and the touch controller 170 included in the touch sensing circuit 150 may be implemented as separate devices or may be implemented as one device.

[0097] In addition, the touch driving circuit 160 and the data driving circuit 120 included in the touch sensing circuit 150 may be implemented as separate devices, or may be implemented as one device.

[0098] The touch display device 100 may further include a power supply circuit that provides various types of power to the display driving circuit and / or the touch sensing circuit 150. At this time, the voltage from the power supply circuit is applied to the display driving circuit and / or the touch sensing circuit 150 to drive the display driving circuit and / or the touch sensing circuit 150.

[0099] The touch display device 100 according to an exemplary embodiment of the present disclosure may be a mobile terminal such as a smartphone, a tablet computer, etc., or may be a display or a television (TV) of various sizes, but is not limited thereto, and may be a display of various types and sizes capable of displaying information or images, but is not limited thereto.

[0100] Figure 2Schematic structure of a display panel 110 of a touch display device 100 according to an exemplary embodiment of the present disclosure is shown.

[0101] Reference Figure 2 , the display panel 110 may include a plurality of sub-pixels SP formed on a substrate SUB. Each of the plurality of sub-pixels SP may include a light emitting device ED, a driving transistor DRT for driving the light emitting device ED, a scanning transistor SCT for transmitting a data voltage Vdata to a first node N1 of the driving transistor DRT, and a storage capacitor Cst for maintaining a constant voltage during one frame, but is not limited thereto. More or less components may be included.

[0102] For example, a driving transistor DRT may be provided for each sub-pixel SP. The driving transistor DRT may include a first node N1 to which a data voltage Vdata may be applied, a second node N2 electrically connected to the light emitting device ED, and a third node N3 to which a first driving power signal EVDD is applied from a first driving power line DVL. In the driving transistor DRT, the first node N1 may be a gate node, the second node N2 may be a source node or a drain node, and the third node N3 may be a drain node or a source node.

[0103] The light emitting device ED may include a first electrode E1, a second electrode E2, and a light emitting layer EL disposed between the first electrode E1 and the second electrode E2.

[0104] For example, the first electrode E1 of the light emitting device ED may be provided for each sub-pixel SP and may be electrically connected to the second node N2 of the driving transistor DRT of each sub-pixel SP. The second electrode E2 of the light emitting device ED may be provided for a plurality of sub-pixels SP in common and may be applied with the second driving power signal EVSS. The first electrode E1 may be referred to as a pixel electrode, and the second electrode E2 may be referred to as a common electrode.

[0105] In addition, for example, the first electrode E1 may be an anode electrode, and the second electrode E2 may be a cathode electrode. Alternatively, the first electrode E1 may be a cathode electrode, and the second electrode E2 may be an anode electrode.

[0106] The display panel 110 may further include a second driving power line VSL for supplying a second driving power signal EVSS to the second electrode E2. In addition, the display panel 110 may further include a first driving power line DVL for supplying a first driving power signal EVDD to the third node N3 of the driving transistor DRT.

[0107] In the following, for the convenience of description, it is assumed that the first electrode E1 is a pixel electrode and an anode electrode, and the second electrode E2 is a common electrode and a cathode electrode, but it is not limited thereto.

[0108] For example, the light emitting device ED may be an organic light emitting diode (OLED), an inorganic light emitting diode, or a quantum dot light emitting device, but is not limited thereto. In this case, if the light emitting device ED is an organic light emitting diode, the light emitting device ED may include an organic layer OML containing an organic material, and the organic layer OML may include a light emitting layer EL as an organic light emitting layer.

[0109] The scan transistor SCT may be connected between the first node N1 of the driving transistor DRT and the corresponding data line DL, and may control a voltage state of the first node N1 of the driving transistor DRT.

[0110] The scan transistor SCT may be turned on or off in response to a scan selection signal SCAN provided from a corresponding scan gate line SCL. For example, the scan transistor SCT may control the connection between the first node N1, which is the gate node of the drive transistor DRT, and a corresponding data line DL among a plurality of data lines DL according to a scan selection signal SCAN provided from a corresponding scan gate line SCL among a plurality of scan gate lines SCL (which are one type of gate lines GL).

[0111] A drain node or a source node of the scanning transistor SCT may be electrically connected to the corresponding data line DL. A source node or a drain node of the scanning transistor SCT may be electrically connected to the first node N1 of the driving transistor DRT. A gate node of the scanning transistor SCT may be electrically connected to a scanning gate line SCL as a type of gate line GL, and may receive a scanning selection signal SCAN.

[0112] The scan transistor SCT may be turned on by a scan enable signal SCAN of an on-level voltage and may transmit a data voltage Vdata provided from a corresponding data line DL to the first node N1 of the driving transistor DRT.

[0113] The scanning transistor SCT may be turned on by a scanning selection signal SCAN of an on-level voltage, and may be turned off by a scanning selection signal SCAN of an off-level voltage. Here, if the scanning transistor SCT is an n-type, the on-level voltage may be a high-level voltage, and the off-level voltage may be a low-level voltage. If the scanning transistor SCT is a p-type, the on-level voltage may be a low-level voltage, and the off-level voltage may be a high-level voltage. When the scanning transistor SCT is turned on, the data voltage Vdata provided from the corresponding data line DL may be transmitted to the first node N1 of the driving transistor DRT.

[0114] The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

[0115] The storage capacitor Cst may be an external capacitor intentionally designed outside the driving transistor DRT, rather than a parasitic capacitor (eg, Cgs, Cgd) that may exist between the first node N1 and the second node N2 of the driving transistor DRT.

[0116] Each of the driving transistor DRT and the scanning transistor SCT may be an n-type transistor or a p-type transistor.

[0117] like Figure 2 As shown, each sub-pixel SP may have a 2T (transistor) -1C (capacitor) structure including two transistors DRT and SCT and one capacitor Cst, and may further include one or more transistors or one or more capacitors depending on the situation. For example, 3T1C, 4T1C, 5T1C, 3T2C, 4T2C, 5T2C, 6T2C, 7T1C, 7T2C, 8T2C structures, etc. may also be used.

[0118] Since the circuit elements (especially the light emitting device ED) in each sub-pixel SP are easily affected by external moisture or oxygen, the display panel 110 may further include an encapsulation layer ENCAP that can prevent external moisture or oxygen from penetrating into the circuit elements (especially the light emitting device ED).

[0119] The encapsulation layer ENCAP may be disposed on the second electrode E2. The encapsulation layer ENCAP may have a single-layer structure or a multi-layer structure including a plurality of sub-encapsulation layers. For example, the encapsulation layer ENCAP may have a multi-layer structure in which an inorganic encapsulation layer, an organic encapsulation layer, and an inorganic encapsulation layer are stacked. The inorganic encapsulation layer may reduce or prevent moisture or oxygen from penetrating from the outside. The organic encapsulation layer may be used to cover particles and, for example, to buffer stress between layers when the display panel is bent.

[0120] As described above, the display panel 110 may include an organic layer OML disposed inside the light emitting device ED or disposed above or below the light emitting device ED, and include an organic material. That is, the organic layer OML included in the light emitting device ED may be composed of an organic material and may include a light emitting layer EL. In addition, the encapsulation layer ENCAP may include an organic encapsulation layer, which is an organic layer OML including an organic material. In addition, the organic layer OML including an organic material may be disposed below the encapsulation layer ENCAP for a planarization function, etc. In addition, the organic layer OML including an organic material may be disposed above the encapsulation layer ENCAP. In this way, the organic layer OML including an organic material may be disposed at various positions on the display panel 110 for various purposes.

[0121] The touch display device 100 according to the exemplary embodiment of the present disclosure may have a top emission structure in which light is emitted in a direction opposite to the substrate SUB of the display panel 110, but is not limited thereto. In this case, the first electrode E1 as a pixel electrode may be a reflective electrode (e.g., a reflective metal) or a transparent electrode (e.g., a transparent metal), and the second electrode E2 as a common electrode may be a transparent electrode (e.g., a transparent metal). Alternatively, the touch display device 100 according to the exemplary embodiment of the present disclosure may have a bottom emission structure.

[0122] Figure 3 A touch sensing system of the touch display device 100 according to an exemplary embodiment of the present disclosure is briefly illustrated.

[0123] Reference Figure 3 The display panel 110 of the touch display device 100 may have a built-in touch panel. The touch panel built into the display panel 110 may also be referred to as a built-in touch panel, an in-cell touch panel, or an on-cell touch panel.

[0124] Reference Figure 3 , if the display panel 110 of the touch display device 100 according to the exemplary embodiment of the present disclosure has a built-in touch panel, the display panel 110 may include a touch sensor arranged in the display area DA.

[0125] The touch sensor may include a plurality of touch electrodes TE disposed in the display area DA separately from each other.

[0126] The touch sensor may further include a plurality of touch lines TL for electrically connecting each of the plurality of touch electrodes TE to the touch driving circuit 160. Here, the touch line TL may also be referred to as a touch wiring.

[0127] according to Figure 3 In the example of FIG. 1 , each of the plurality of touch electrodes TE may be disposed separately from each other. In this case, each of the plurality of touch electrodes TE may not overlap each other in the vertical direction.

[0128] Alternatively, the plurality of touch electrodes TE may include touch electrodes TE in a first direction and touch electrodes TE in a second direction different from the first direction. In this case, the touch electrodes TE in the first direction and the touch electrodes TE in the second direction may intersect each other.

[0129] according to Figure 3In an example of FIG. 1 , each of the plurality of touch electrodes TE may be connected to one or more touch lines TL. Each touch line TL may electrically connect the corresponding touch electrode TE to the touch driving circuit 160.

[0130] Each touch line TL may overlap one or more touch electrodes TE.

[0131] Reference Figure 3 For example, among the touch electrodes TE arranged in the first column, the first touch electrode TE arranged in the first row may be electrically connected to the first touch line TL. The first touch line TL may overlap with some touch electrodes TE other than the first touch electrode TE among the touch electrodes TE arranged in the first column without being electrically connected thereto.

[0132] Reference Figure 3 For example, when the touch display device 100 senses touch based on the self-capacitance method, the touch driving circuit 160 can provide a touch driving signal to at least one touch electrode TE among the plurality of touch electrodes TE, and sense the touch electrode TE provided with the touch driving signal.

[0133] Each of the plurality of touch electrodes TE may be an electrode without an opening, or may be a grid-type electrode in which a plurality of openings are formed. As an example, a color filter array including a color filter and a black matrix may be further provided on the plurality of touch electrodes, or a lens array may be further provided on the plurality of touch electrodes.

[0134] In addition, each of the plurality of touch electrodes TE may be an opaque electrode or a transparent electrode, but is not limited thereto. Alternatively, each of the plurality of touch electrodes TE may include an opaque electrode and a transparent electrode.

[0135] Each of the plurality of touch electrodes TE may overlap with a region where two or more sub-pixels SP are formed. Alternatively, each of the plurality of touch electrodes TE may be located in a region that does not overlap with the sub-pixel SP.

[0136] The sensing value of the touch electrode TE provided with the touch drive signal may be a value corresponding to the capacitance or capacitance change at the touch electrode TE provided with the touch drive signal. The capacitance at the touch electrode TE provided with the touch drive signal may be the capacitance between the touch electrode TE provided with the touch drive signal and a touch object such as a finger.

[0137] As described above, in the touch display device 100 according to the exemplary embodiment of the present disclosure, if a touch sensor including a plurality of touch electrodes TE is built into the display panel 110, during the manufacturing process of the display panel 110, the touch electrodes TE and the touch lines TL may also be formed together when forming the patterns of electrodes and lines related to display driving, but is not limited thereto.

[0138] Figure 4 A touch driving circuit 160 of the touch display device 100 according to an exemplary embodiment of the present disclosure is shown.

[0139] Reference Figure 4 The touch driving circuit 160 may include S (S is a natural number greater than or equal to 1) charge amplifiers CAMP and Q (Q is a natural number greater than or equal to 1) analog-to-digital converters ADC, but is not limited thereto.

[0140] The touch drive circuit 160 may further include a first selection circuit for selecting S touch lines TL from among the plurality of touch lines TL and electrically connecting the S touch lines TL to the S charge amplifiers CAMP. In addition, the touch drive circuit 160 may further include a second selection circuit for selecting Q charge amplifiers CAMP from among the S charge amplifiers CAMP and connecting the Q charge amplifiers CAMP to the Q analog-to-digital converters ADC.

[0141] Reference Figure 4 , the charge amplifier CAMP may include a first input terminal IN1 , a second input terminal IN2 , and an output terminal OUT.

[0142] The charge amplifier CAMP may further include a feedback capacitor Cfb connected between the second input terminal IN2 and the output terminal OUT. If charges flow into the charge amplifier CAMP, the charges may be charged in the feedback capacitor Cfb.

[0143] The charge amplifier CAMP may further include a reset switch SRST connected between the second input terminal IN2 and the output terminal OUT When the touch driving circuit 160 performs an operation for touch sensing, the reset switch SRST may be in a closed state.

[0144] The driving signal VCM may be input to a first input terminal IN1 of the charge amplifier CAMP. A second input terminal IN2 of the charge amplifier CAMP may be electrically connected to one touch pad T-PAD selected from a plurality of touch pads T-PAD arranged on the display panel 110. Here, the touch line TL may be electrically connected to the touch pad T-PAD electrically connected to the second input terminal IN2.

[0145] The driving signal VCM input to the first input terminal IN1 of the charge amplifier CAMP may be provided to the touch line TL connected to the touch pad T-PAD through the second input terminal IN2 of the charge amplifier CAMP, but is not limited thereto. The driving signal VCM provided to the touch line TL may be provided to the touch electrode TE connected to the touch line TL.

[0146] Reference Figure 4 The touch driving circuit 160 may further include a charge removal circuit CR connected to the second input terminal IN2 of the charge amplifier CAMP. The charge removal circuit CR may control the amount of charge at the second input terminal IN2 of the charge amplifier CAMP according to the input charge removal control signal VCR.

[0147] If charges flow into the second input terminal IN2 of the charge amplifier CAMP, the charges may be charged in the feedback capacitor Cfb. An output voltage VOUT corresponding to the amount of charges charged in the feedback capacitor Cfb may be output to the output terminal OUT of the charge amplifier CAMP.

[0148] The amount of charges charged in the feedback capacitor Cfb may vary according to an electrical state (eg, capacitance, etc.) of the touch electrode TE electrically connected to the second input terminal IN2 of the charge amplifier CAMP.

[0149] The analog-to-digital converter ADC may convert an output voltage VOUT output from an output terminal OUT of the charge amplifier CAMP into a digital value and output the converted output voltage.

[0150] Reference Figure 4 , the touch drive circuit 160 may further include an integrator INTG connected between the output terminal OUT of the charge amplifier CAMP and the analog-to-digital converter ADC. The integrator INTG may integrate the output voltage VOUT outputted from the output terminal OUT of the charge amplifier CAMP, and output the integrated value of the output voltage VOUT after integration. In addition, the analog-to-digital converter ADC may convert the integrated value into a digital value. Therefore, the value outputted from the analog-to-digital converter ADC may have a value that allows more accurate information processing.

[0151] For example, during a touch period for touch sensing, a value output from the analog-to-digital converter ADC may be referred to as a touch sensing value. The touch controller 170 may determine the presence or absence of a touch and / or touch coordinates by using the touch sensing value output from the analog-to-digital converter ADC.

[0152] Figure 5 is a diagram for explaining a change in touch sensitivity when thermal drift occurs due to a touch pointer in the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0153] Figure 5 The three graphs 500 , 510 , and 520 shown are graphs representing touch sensing values ​​output from the touch driving circuit 160 from before the touch occurs to after the touch occurs when a user touches the display panel 110 with a touch pointer such as a finger or a pen for a period of time.

[0154] The reference curve graph 500 shows touch sensing values ​​over time for a normal driving state in which, when a user touches the display panel 110 with a touch pointer such as a finger or a pen, the temperature of the touch pointer is not transmitted to the display panel 110. For example, the reference graph 500 shows a touch sensing value before a touch occurs, a touch sensing value when a touch occurs, and a touch sensing value after a touch occurs.

[0155] Referring to the reference curve graph 500 , a touch sensing value before a touch occurs may have a threshold value. Here, the threshold value may be a touch sensing value naturally caused by a parasitic capacitance Cp formed on a corresponding touch electrode TE inside the display panel 110 before the touch occurs.

[0156] Referring to the reference curve graph 500, when a touch occurs, a finger capacitance Cfinger may be formed between the corresponding touch electrode TE and the finger, and thus the touch sensing value may increase. The increased touch sensing value may be determined by the parasitic capacitance Cp and the finger capacitance Cfinger. Here, the finger capacitance Cfinger may be a self capacitance.

[0157] Referring to the reference curve graph 500 , after a touch occurs, a touch sensing value may increase and then be maintained at a constant level during a period in which the touch is maintained.

[0158] Referring to the reference curve graph 500 , when the user releases the touch, that is, when the touch ends, the finger capacitance Cfinger may disappear, and the touch sensing value may decrease to a level before the touch occurs.

[0159] Reference Figure 5 , the first curve graph 510 and the second curve graph 520 represent touch sensing values ​​over time for the following state, namely: when the user touches the display panel 110 with a touch indicator such as a finger or a pen, if the temperature of the touch indicator is higher than the temperature of the display panel 110, the temperature of the touch indicator is transmitted to the display panel 110.

[0160] For example, the first graph 510 shows a touch sensing value before a touch occurs, a touch sensing value when a touch occurs, and a touch sensing value after a touch occurs. Figure 5, referring to the first curve graph 510, the touch sensing value may have a threshold value before the touch occurs. Here, the threshold value may be a touch sensing value naturally caused by the parasitic capacitance Cp formed on the corresponding touch electrode TE inside the display panel 110 before the touch occurs.

[0161] Referring to the first curve graph 510, if a touch occurs, a finger capacitance Cfinger may be formed between the corresponding touch electrode TE and the finger, and thus, a touch sensing value may increase. The increased touch sensing value may be determined by the parasitic capacitance Cp and the finger capacitance Cfinger.

[0162] Referring to the first curve graph 510 , after a touch occurs, during a period in which the touch is maintained, the touch sensing value may not remain constant, and a phenomenon in which the touch sensing value additionally increases may occur.

[0163] As a result of analyzing the cause of the additional increase in the touch sensing value, the following analysis results have been obtained. If the temperature of the touch indicator touching the display panel 110 is higher than the surface temperature of the display panel 110 (or the temperature of the corresponding touch electrode TE), the temperature of the touch indicator may be transmitted to the display panel 110, and a temperature change (e.g., a temperature increase) may occur in the display panel 110. This may cause an increase in parasitic capacitance in the touch electrode TE, which may cause a further increase in the touch sensing value, but is not limited thereto.

[0164] When the temperature of the touch indicator is transmitted to the display panel 110, the dielectric constant of the organic material constituting the organic layer OML included in the display panel 110 may change due to the temperature change (e.g., temperature increase) of the display panel 110. Therefore, due to the unique characteristics of the organic material, the parasitic capacitance at the corresponding touch electrode TE may increase. The increase ΔCp of the parasitic capacitance at the corresponding touch electrode TE may further increase the touch sensing value. Here, during the touch occurrence time, the parasitic capacitance increase ΔCp may be a phenomenon caused by the corresponding organic material when the temperature increases, and may correspond to the material unique characteristics of the corresponding organic material.

[0165] As in the first curve graph 510 , if the temperature of the touch pointer is higher than the surface temperature of the display panel 110 , the phenomenon that the parasitic capacitance increases ΔCp due to the higher temperature of the touch pointer during the touch occurrence time may be referred to as a positive thermal drift phenomenon, but is not limited thereto.

[0166] Referring to the first curve graph 510, when the user releases the touch, that is, when the touch ends, the touch sensing value may not drop, but may not immediately drop to the level before the touch occurs, but may remain above the level of the touch threshold for a short period of time even after the touch ends. Here, the touch threshold may refer to the minimum touch sensing value for determining that the touch has occurred. As a result, even after the touch ends, the touch can still be recognized as existing. In this way, a touch that does not actually exist but is recognized as existing can be referred to as a ghost touch. In addition, if a ghost touch is identified, the ghost touch may cause a significant reduction in touch sensitivity, but is not limited thereto. In addition, the touch sensitivity may be reduced not only by finger touch but also by image changes.

[0167] For example, the second curve graph 520 shows the touch sensing value before the touch occurs, the touch sensing value when the touch occurs, and the touch sensing value after the touch occurs. Figure 5 In the second curve graph 520, before the touch occurs, the touch sensing value may have a threshold value. Here, the threshold value may be a touch sensing value naturally caused by the parasitic capacitance Cp formed in the corresponding touch electrode TE inside the display panel 110 before the touch occurs.

[0168] Referring to the second curve graph 520, if a touch occurs, a finger capacitance Cfinger may be formed between the corresponding touch electrode TE and the finger, and accordingly, a touch sensing value may increase. The increased touch sensing value may be determined by the parasitic capacitance Cp and the finger capacitance Cfinger.

[0169] Referring to the second curve graph 520 , after a touch occurs, during a period in which the touch is maintained, the touch sensing value may not remain constant, but there may be a phenomenon in which the touch sensing value may decrease.

[0170] As a result of analyzing the cause of the decrease in the touch sensing value, the following analysis results have been obtained. If the temperature of a touch indicator (such as a finger or a pen) touching the display panel 110 is higher than the surface temperature of the display panel 110 (or the temperature of the corresponding touch electrode TE), the temperature of the touch indicator may be transmitted to the display panel 110, which may cause a change in the temperature of the display panel 110. This may cause a decrease in the parasitic capacitance in the touch electrode TE, which may cause a decrease in the touch sensing value, but is not limited thereto.

[0171] When the temperature of the touch indicator is transmitted to the display panel 110, the dielectric constant of the organic material constituting the organic layer OML included in the display panel 110 may change according to the temperature change (e.g., temperature increase). As a result, the parasitic capacitance in the touch electrode TE may be reduced due to the unique characteristics of the organic material. The parasitic capacitance reduction ΔCp in the touch electrode TE may reduce the touch sensing value. Here, during the touch occurrence time, the parasitic capacitance reduction ΔCp may be a phenomenon caused by the organic material when the temperature increases, and may correspond to the material unique characteristics of the organic material.

[0172] As in the second curve graph 520 , when the temperature of the touch pointer is higher than the surface temperature of the display panel 110 , the phenomenon that the parasitic capacitance decreases by ΔCp due to the higher temperature of the touch pointer during the touch occurrence time may be referred to as a negative thermal drift phenomenon.

[0173] In this manner, if the touch sensing value decreases while the user maintains the touch, the signal-to-noise ratio (SNR) may decrease, which may degrade the touch sensitivity, as shown in the second curve graph 520. In addition, if a ghost touch is recognized, the ghost touch may cause a significant decrease in touch sensitivity, as shown in the first curve graph 510.

[0174] Fig. 6A is a diagram for explaining a change in touch sensitivity (eg, a change in a touch sensing value) caused by a finger touch in the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0175] Reference Fig. 6A If a finger touch occurs, the temperature of the finger may be transferred to the display panel 110, which may cause a positive thermal drift phenomenon, but is not limited thereto. A temperature change of the display panel 110 may occur due to a finger touch. That is, if the temperature of the touch pointer is higher than the surface temperature of the display panel 110, during the touch occurrence time, the parasitic capacitance may increase by ΔCp due to the higher temperature of the touch pointer.

[0176] Reference Fig. 6A , the temperature change of the display panel 110 may occur due to the finger touch. The change amount of the touch sensing value due to the temperature change of the display panel 110 caused by the finger touch may include the change amount of the touch sensing value due to the finger touch (A) and the change amount of the touch sensing value due to the temperature of the finger (B), but is not limited thereto.

[0177] The amount of change (A) of the touch sensing value due to the finger touch may be a normal part required for touch sensing, and may be a part occurring due to the finger capacitance Cfinger.

[0178] The change amount (B) of the touch sensing value due to the temperature of the finger may be an unwanted portion that may cause touch sensitivity degradation, and may be a portion caused by a parasitic capacitance increase ΔCp due to a positive thermal drift phenomenon during a finger touch period.

[0179] After the finger touch disappears, the touch sense value may decrease, but may not immediately drop to the level before the touch occurs, and may have a value higher than the touch threshold for a certain period of time. Here, the touch threshold may represent the minimum touch sense value for determining the occurrence of a touch.

[0180] Even if the finger touch disappears, if a touch sensing value higher than the touch threshold is obtained from the touch driving circuit 160 within a certain period of time (i.e., a ghost touch occurrence period), the touch controller 170 may erroneously recognize that a touch occurs. Such ghost touch recognition may be a factor that significantly reduces touch sensitivity.

[0181] Figure 6B is a diagram for explaining a change in touch sensitivity (eg, a change in a touch sensing value) according to an image change in the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0182] Reference Figure 6B , the touch sensitivity may be reduced not only by finger touch but also by image change. Here, the image change may refer to a change in the grayscale of the image. In an exemplary embodiment of the present disclosure, the image change may have an effect equivalent to a temperature change of the display panel 110.

[0183] Reference Figure 6B , showing that the phenomenon of the surface temperature increase of the display panel due to the touch of a finger may similarly occur in the case of an image change. That is, if the image changes, the positive thermal drift phenomenon may similarly occur. That is, even if no touch occurs, a change in the touch sensing value may occur due to an image change.

[0184] Reference Figure 6B , the change amount of the touch sensing value due to the image change may be considered as the change amount (C) of the touch sensing value due to the temperature change of the display panel 110 corresponding to the image change.

[0185] For example, when changing from a low grayscale image (e.g., a black image) to a high grayscale image (e.g., a white image), even if a touch does not actually occur, a touch sensing value higher than the touch threshold may be acquired from the touch drive circuit 160. When changing from a high grayscale image (e.g., a white image) to a low grayscale image (e.g., a black image), the touch sensing value may not drop below the touch threshold immediately, but may drop below the touch threshold after a short period of time.

[0186] Reference Figure 6B , even if a touch does not actually occur, if a touch sensing value higher than the touch threshold is obtained from the touch driving circuit 160 according to the image change, the touch controller 170 may recognize that a touch has occurred during a period in which the touch sensing value is higher than the touch threshold (e.g., a ghost touch occurrence period), but is not limited thereto. Such ghost touch recognition may be a factor that significantly reduces touch sensitivity.

[0187] Alternatively, even if a touch does not actually occur, if a touch sensing value higher than the touch threshold is obtained from the touch driving circuit 160 according to the finger touch, the touch controller 170 may recognize that a touch has occurred during a period (e.g., a ghost touch occurrence period) when the touch sensing value is higher than the touch threshold, but is not limited thereto. Such ghost touch recognition may be a factor that significantly reduces touch sensitivity.

[0188] Therefore, exemplary embodiments of the present disclosure may provide a temperature sensing structure and a temperature sensing method capable of preventing a decrease in touch sensitivity due to a temperature change of the display panel 110 and a compensation processing method for a touch sensitivity change due to a temperature change.

[0189] Hereinafter, a temperature sensing structure and a temperature sensing method according to an exemplary embodiment of the present disclosure and a compensation processing method for a touch sensitivity change caused by a temperature change will be described. Here, the temperature change of the display panel 110 may be caused by the temperature of a touch indicator such as a finger or a pen, or may be related to an image change.

[0190] Figure 7 A touch sensor configuration for compensating for a change in touch sensitivity according to a temperature change of the display panel 110 in the touch display device 100 according to an exemplary embodiment of the present disclosure is shown.

[0191] Reference Figure 7 , the touch panel region TSP in the display panel 110 may include a plurality of touch electrodes TE and a plurality of touch lines TL. The plurality of touch lines TL may be connected to the plurality of touch electrodes TE, respectively, but is not limited thereto.

[0192] The plurality of touch electrodes TE may include a first touch electrode TE1, and the plurality of touch lines TL may include a first touch line TL1 connected to the first touch electrode TE1.

[0193] Reference Figure 7 Each of the plurality of touch electrodes TE may not be a single plate electrode, but may be composed of a plurality of touch sensors TS connected by a touch bridge TB, but is not limited thereto. The configuration of each of the plurality of touch electrodes TE will be described below using the first touch electrode TE1 as an example.

[0194] Reference Figure 7 , the first touch electrode unit region TEU1 where the first touch electrode TE1 is formed may include touch sensors TS arranged in n rows and m columns. That is, the first touch electrode unit region TEU1 where the first touch electrode TE1 is formed may include n×m touch sensors TS.

[0195] The first touch electrode unit area TEU1 may include a touch bridge TB electrically connecting all of the n×m touch sensors TS.

[0196] The touch bridges TB included in the first touch electrode unit area TEU1 may include row-direction touch bridges TB connecting the touch sensors TS arranged in the same row and column-direction touch bridges TB connecting the touch sensors TS arranged in the same column.

[0197] Reference Figure 7 , the n×m touch sensors TS included in the first touch electrode unit area TEU1 may include a first touch sensor TS1 .

[0198] The touch bridge TB included in the first touch electrode unit area TEU1 may include a first touch bridge TB1 connecting the first touch sensor TS1 to another touch sensor TS adjacent in a row direction.

[0199] Reference Figure 7 , the first touch electrode unit area TEU1 may include n×m touch sensor unit areas TSU. The n×m touch sensor unit areas TSU may be areas each corresponding to the n×m touch sensors TS.

[0200] In order to explain the structure of each of the n×m touch sensor unit regions TSU, the first touch sensor unit region TSU1 where the first touch sensor TS1 is located is illustrated.

[0201] Reference Figure 7 , the first touch sensor unit area TSU1 may include a first pixel area PA1 where at least one first sub-pixel SP is provided and a first touch sensor area TSA1 where the first touch sensor TS1 is provided.

[0202] The first touch sensor area TSA1 may be located at one side of the first pixel area PA1, but is not limited thereto.

[0203] The first sub-pixel SP disposed in the first pixel region PA1 may include a light emitting device ED and a scanning transistor SCT, etc. In addition, the first sub-pixel SP disposed in the first pixel region PA1 may further include a driving transistor DRT and a capacitor Cst. The first sub-pixel SP may include a light emitting device ED and a scanning transistor SCT, etc. Figure 2 Configuration shown.

[0204] Reference Figure 7 , the first display driving line DDL may be disposed across the first touch sensor unit region TSU1. The first display driving line DDL may be connected to the first sub-pixel SP1. In addition, the first scan gate line SCL1 may be electrically connected to the first sub-pixel SP1.

[0205] Reference Figure 7 , the first touch line TL1 may be disposed across the first touch sensor unit region TSU1 , the first touch line TL1 may be electrically connected to the first touch sensor TS1 , and the first touch line TL1 may be connected to the touch driving circuit 160 .

[0206] Reference Figure 7 The touch display device 100 according to the exemplary embodiment of the present disclosure may further include a first sensing line SL1 disposed adjacent to the first touch sensor TS1 and a first sensing transistor ST1 for controlling an electrical connection between the first sensing line SL1 and the first touch sensor TS1.

[0207] Reference Figure 7 , the first sensing line SL1 may be disposed across the first touch sensor unit region TSU1 , and the first sensing transistor ST1 may be disposed within the first touch sensor unit region TSU1 .

[0208] Reference Figure 7 , the scan gate lines may include a first scan gate line SCL1, a second scan gate line SCL2, and an nth scan gate line SCLn.

[0209] Reference Figure 7 , the first scan gate line SCL1 may be electrically connected to a gate node of a scan transistor SCT within a first sub-pixel SP. The first scan gate line SCL1 may provide a first scan selection signal SCAN[1] to a gate node of the scan transistor SCT within the first sub-pixel SP. The scan transistor SCT within the first sub-pixel SP may be turned on or off in response to the first scan selection signal SCAN[1] provided from the first scan gate line SCL1.

[0210] Reference Figure 7The first scan gate line SCL1 may be electrically connected to a gate node of the first sensing transistor ST1 within the first touch sensor unit region TSU1. The first sensing transistor ST1 within the first touch sensor unit region TSU1 may be turned on or off in response to a first scan gate signal SCAN[1] provided from the first scan gate line SCL1.

[0211] Therefore, the first scan gate line SCL1 may simultaneously provide the first scan gate signal SCAN[1] for simultaneously controlling on and off of the first sensing transistor ST1 and the scan transistor SCT to the scan transistor SCT and the first sensing transistor ST1 in the first subpixel SP.

[0212] Therefore, the first sensing transistor ST1 and the scan transistor SCT in the first subpixel SP may be simultaneously turned on or simultaneously turned off in response to the first scan selection signal SCAN[1], but is not limited thereto.

[0213] When the scan transistor SCT in the first sub-pixel SP is turned on, the first sensing transistor ST1 may also be turned on so that the first touch sensor TS1 and the first sensing line SL1 may be electrically connected.

[0214] That is, when the first touch sensor TS1 is connected to the first sensing line SL1, the scanning transistor SCT in the first sub-pixel SP may be turned on. In addition, the first sensing transistor ST1 may also be turned on.

[0215] When the scan transistor SCT in the first subpixel SP is turned off, the first sensing transistor ST1 may also be turned off, so that the first touch sensor TS1 and the first sensing line SL1 may be electrically separated.

[0216] That is, when the first touch sensor TS1 is not connected to the first sensing line SL1, the scanning transistor SCT in the first sub-pixel SP may be turned off. In addition, the first sensing transistor ST1 may also be turned off.

[0217] Reference Figure 7 The touch display device 100 according to the exemplary embodiment of the present disclosure may further include a first touch bridge TB1 for electrical connection between the first touch sensor TS1 and the first touch line TL1.

[0218] Reference Figure 7 , the first resistance pattern R1 may be connected between the first touch line TL1 and the first touch sensor TS1.

[0219] The first resistance pattern R1 may be a resistor connected between the first touch bridge TB1 and the first touch sensor TS1. Alternatively, the first resistance pattern R1 may be a resistor connected between an extension of the first touch bridge TB1 and the first touch sensor TS1. Alternatively, the first resistance pattern R1 may be a resistor existing in the first touch bridge TB1, or may be a resistance component of the first touch bridge TB1 or its extension.

[0220] Reference Figure 7 The display panel 110 may further include one or more display common electrodes corresponding to the second electrode E2 of the light emitting device ED of the first sub-pixel SP, but is not limited thereto.

[0221] If the display panel 110 includes one display common electrode, the display common electrode may be disposed in the entire area of ​​the display panel 110 and may be a single undivided metal.

[0222] In contrast, if the display panel 110 includes a plurality of display common electrodes, each of the plurality of display common electrodes may be disposed only in a pixel region within each touch sensor unit region TSU. For example, one display common electrode may be disposed in a first pixel region PA1 within a first touch sensor unit region TSU1. For example, one display common electrode may be disposed in a second pixel region PA2 within a second touch sensor unit region TSU2.

[0223] Reference Figure 7 The first display driving line DDL may be various signal lines for display driving.

[0224] For example, the first display drive line DDL may include at least one of a data line DL for providing a data voltage Vdata to the first sub-pixel SP, a first drive power line DVL for providing a first drive power signal EVDD to the first sub-pixel SP, a second drive power line VSL for providing a second drive power signal EVSS to the first sub-pixel SP, or a reference voltage line for providing a reference voltage to the first sub-pixel SP, but is not limited thereto.

[0225] For example, if the first display driving line DDL is the second driving power line VSL, the first display driving line DDL may be the second driving power line VSL connectable to the second electrode E2 of the light emitting device ED to provide the second driving power signal EVSS to the second electrode E2.

[0226] In this case, the first display driving line DDL as the second driving power line VSL may be electrically connected to the second electrode E2 of the light emitting device ED so as to provide the second driving power signal EVSS to the second electrode E2.

[0227] The first touch sensor TS1 disposed in the first touch sensor area TSA1 may include the same material as the display common electrode, but is not limited thereto. For example, during the panel manufacturing process, the display common electrode (e.g., the second electrode E2) and the touch sensor TS may be formed in a separate form by patterning the display common electrode material (e.g., the cathode electrode material).

[0228] In addition, refer to Figure 7 , within the first touch sensor unit area TSU1, the first pixel area PA1 may be a non-transmission area (also referred to as a non-transparent area) that does not transmit light, and the first touch sensor area TSA1 may be a transmission area (also referred to as a transparent area) that transmits light. Therefore, the first touch sensor TS1 may be composed of a transparent electrode material. In addition, the display common electrode provided in the first pixel area PA1 may be composed of the same transparent electrode material as the first touch sensor TS1, but is not limited thereto. Here, the transmission area TA may refer to an area that transmits external light so that the background can be recognized from the front.

[0229] Figure 8 Shown in more detail Figure 7 The first touch sensor unit region TSU1 is shown in FIG.

[0230] Figure 8 The structure of the first touch sensor unit area TSU1 is Figure 7 A more detailed example of the structure of the first touch sensor unit area TSU1 is shown in FIG. Figure 8 The structure of the first touch sensor unit area TSU1 will be mainly described. Figure 7 The difference in the structure of the first touch sensor unit region TSU1.

[0231] Reference Figure 8 , three first display driving lines DDL including a first driving power line DVL, a second driving power line VSL, and a reference voltage line RVL may be disposed in a column direction, but is not limited thereto.

[0232] A plurality of sub-pixels may be provided in the first pixel region PA1. The plurality of sub-pixels may include, but are not limited to, a red sub-pixel, a green sub-pixel, and a blue sub-pixel. Figure 8 , for example, four sub-pixels R, W, B, and G may be disposed in the first pixel area PA1. For example, the four sub-pixels R, W, B, and G may include a red sub-pixel R emitting red light, a white sub-pixel W emitting white light, a blue sub-pixel B emitting blue light, and a green sub-pixel G emitting green light. As an example, sub-pixels of other colors such as magenta, cyan, or yellow may be alternatively or additionally included, but are not limited thereto.

[0233] For example, in the first pixel area PA1, four sub-pixels R, W, B, and G may be arranged in two rows and two columns.

[0234] Reference Figure 8 , the reference voltage line RVL and the first driving power line DVL may be arranged in a column direction. Figure 8 , the reference voltage line RVL and the first driving power line DVL may be disposed to cross the first pixel area PA1.

[0235] Reference Figure 8 The second driving power line VSL may be located between the first pixel area PA1 and the first touch sensor area TSA1 and may be arranged in a column direction. Auxiliary lines connected to the second driving power line VSL may be arranged in a row direction.

[0236] Reference Figure 8 The transmission area TA may be an area between the second driving power line VSL and the first sensing line SL1. The transmission area TA may include a first touch sensor area TSA1 where the first touch sensor TS1 is disposed, and may further include at least one of a first sensing transistor, a first touch bridge TB1, and a first scan gate line SCL1.

[0237] The transmission area may be an area between the second driving power line VSL and the first sensing line SL1 that does not include at least one of the first sensing transistor, the first touch bridge TB1, and the first scanning gate line SCL1. The first touch sensor TS1 may be formed of a transparent electrode material. In addition, a display common electrode provided in the first pixel area PA1 may be formed of the same transparent electrode material as the first touch sensor TS1, but is not limited thereto. For example, the non-transmission area may be an area where transistors associated with sub-pixels R, W, B, and G in the first pixel area PA1 are provided. The transmission area TA may represent an area outside the non-transmission area and having a higher transmittance than the non-transmission area. The transmission area TA may be an area where transistors associated with sub-pixels R, W, B, and G in the first pixel area PA1 are not provided. The transmission area TA may include a first touch sensor area TSA1 where the first touch sensor TS1 is provided. The non-transmission area may include an area where a display common electrode is provided, and the transmission area TA may include an area where a display common electrode is not provided. The transmission area TA described here may also be referred to as a transparent area. The non-transmission area described herein may also be referred to as a non-transparent area.

[0238] As described above, the temperature change of the display panel 110 may occur due to the touch of a touch pointer (e.g., a finger, a pen) higher than the surface temperature of the display panel 110, or an image change may occur, resulting in an undesirable parasitic capacitance change ΔCp in the touch electrode TE, which may deteriorate the touch sensitivity. That is, the touch sensitivity may be reduced not only by the finger touch but also by the image change.

[0239] In an exemplary embodiment of the present disclosure, the image change may have an effect equivalent to the temperature change of the display panel 110. Therefore, even if the temperature change of the display panel 110 caused by the touch of a touch indicator (e.g., a finger, a pen) having a temperature higher than the surface temperature of the display panel 110 is described, for the convenience of explanation, the temperature change of the display panel 110 should be regarded as including the concept of image change. In addition, even if the temperature change of the display panel 110 is described as being caused by an image change, for the convenience of explanation, the temperature change of the display panel 110 should be regarded as including the concept of the touch of a touch indicator (e.g., a finger, a pen) having a temperature higher than the surface temperature of the display panel 110. Here, the image change may represent a change in the grayscale of the image, but is not limited thereto. In addition, the touch indicator may include a finger and a pen, but in the following, for the convenience of explanation, a finger will be used as an example.

[0240] The touch display device 100 according to an exemplary embodiment of the present disclosure may include a temperature sensing structure to compensate for a reduction in touch sensitivity due to a temperature change of the display panel 110 caused by a finger touch.

[0241] The temperature sensing structure included in the touch display device 100 according to the exemplary embodiment of the present disclosure may be included in each of the plurality of touch sensor unit regions TSU.

[0242] Reference Figure 7 and Figure 8 , the temperature sensing structure associated with the first touch sensor unit region TSU1 may include a first sensing transistor ST1, a first resistance pattern R1, a first sensing line SL1, a first touch sensor TS1, and a first touch line TL1, but is not limited thereto.

[0243] Hereinafter, a temperature sensing method using a temperature sensing structure according to an exemplary embodiment of the present disclosure and a touch sensitivity variation compensation method based on temperature sensing will be described.

[0244] Fig. 91 shows a driving timing of the touch display device 100 according to an exemplary embodiment of the present disclosure. For example, the touch display device 100 according to an exemplary embodiment of the present disclosure may divide one frame time into one or more display periods DP and one or more touch periods TP.

[0245] Reference Fig. 9 According to the exemplary embodiment of the present disclosure, the touch display device 100 can divide one frame time into a display period DP and a touch period TP, but is not limited thereto, and a display drive for image display (i.e., image update) is performed during the display period DP, and a touch drive for sensing touch is performed during the touch period TP.

[0246] Alternatively, the touch display device 100 according to the exemplary embodiment of the present disclosure may divide one frame time into a plurality of display periods DP and a plurality of touch periods TP, perform display driving for image display (i.e., image update) during each display period DP, and perform touch driving for sensing touch during each touch period TP. In this case, the display period DP and the touch period TP may alternate.

[0247] like Figure 7 and Figure 8 As shown, in the first touch sensor unit region TSU1, the first scan gate line SCL1 may be simultaneously connected to the gate node of the scan transistor SCT of the first sub-pixel SP and the gate node of the first sensing transistor ST1.

[0248] Therefore, in the first touch sensor unit region TSU1 , the first scan gate line SCL1 can simultaneously provide the first scan gate signal SCAN[ 1 ] to the gate node of the scan transistor SCT of the first subpixel SP and the gate node of the first sensing transistor ST1 to simultaneously control the on and off of the scan transistor SCT and the first sensing transistor ST1 .

[0249] Therefore, in the first touch sensor unit region TSU1 , the first sensing transistor ST1 and the scan transistor SCT in the first sub-pixel SP may be simultaneously turned on or simultaneously turned off in response to the first scan selection signal SCAN[ 1 ], but is not limited thereto.

[0250] As mentioned above, Fig. 9 As shown, the touch display device 100 according to the exemplary embodiment of the present disclosure may simultaneously perform a temperature sensing operation during the display period DP.

[0251] During the display period DP in which the data voltage for image display is supplied to the first sub-pixel SP in the first touch sensor unit region TSU1 , the first sensing transistor ST1 in the first touch sensor unit region TSU1 may be turned on.

[0252] That is, during the period in which the first sensing transistor ST1 in the first touch sensor unit region TSU1 is turned on, that is, during the period in which the temperature sensing operation is performed, the data voltage Vdata for image display may be provided to the first sub-pixel SP. At this time, the scanning transistor SCT of the first sub-pixel SP in the first touch sensor unit region TSU1 may be turned on.

[0253] During the touch period TP, the first sensing transistor ST1 in the first touch sensor unit region TSU1 may be turned off. At this time, the scanning transistor SCT of the first sub-pixel SP in the first touch sensor unit region TSU1 may be turned off.

[0254] The touch display device 100 according to the exemplary embodiment of the present disclosure may perform a temperature sensing process on each of a plurality of touch sensor unit areas TSU included in each of a plurality of touch electrode unit areas TEU.

[0255] Hereinafter, the temperature sensing process will be described by taking the first touch sensor unit area TSU1 within the first touch electrode unit area TEU1 as an example.

[0256] The first sensing transistor ST1 may have a characteristic in which mobility varies according to temperature variation. Temperature variation in the first touch sensor unit region TSU1 may be detected by utilizing this characteristic.

[0257] The touch display device 100 according to the exemplary embodiment of the present disclosure can measure the current flowing through the first sensing transistor ST1 and sense the temperature based on the measured current. If the mobility of the first sensing transistor ST1 increases, the amount of current flowing through the first sensing transistor ST1 can be increased. In addition, if the mobility of the first sensing transistor ST1 decreases, the amount of current flowing in the first sensing line SL1 per unit time may decrease.

[0258] The temperature sensing of the touch display device 100 according to the exemplary embodiment of the present disclosure can be performed according to two driving methods, but is not limited thereto. Depending on the two driving methods, the lines used to perform current sensing for temperature sensing may be different, and the driving method of each of the first sensing line SL1 and the first touch line TL1 may be different.

[0259] The two driving methods may include a first driving method in which the first sensing line SL1 becomes a current sensing path and a second driving method in which the first touch line TL1 becomes a current sensing path. Hereinafter, the first driving method will be described in detail first, and then the second driving method will be described in detail.

[0260] Fig.10 The first touch sensor unit region TSU1 during the display period DP in which temperature sensing is performed in the touch display device 100 according to an exemplary embodiment of the present disclosure is illustrated.

[0261] Reference Fig.10 , the touch display device 100 according to the exemplary embodiment of the present disclosure may further include a current sensing circuit TSC connected to the first sensing line SL1 to sense a current flowing in the first sensing line SL1 .

[0262] Reference Fig.10 During the display period DP, the first scan selection signal SCAN[1] may have a turn-on level voltage for a specific period of time (eg, one horizontal time or two horizontal times, etc.). Fig.10 As shown, if the first sensing transistor ST1 is an n-type transistor, the on-level voltage of the first scanning selection signal SCAN[1] may be a high level voltage. If the first sensing transistor ST1 is a p-type transistor, the on-level voltage of the first scanning selection signal SCAN[1] may be a low level voltage. Also, if the scanning transistor SCT in the sub-pixel is an n-type transistor, the on-level voltage of the first scanning selection signal SCAN[1] may be a high level voltage. If the scanning transistor SCT in the sub-pixel is a p-type transistor, the on-level voltage of the first scanning selection signal SCAN[1] may be a low level voltage.

[0263] Reference Fig.10 During the display period DP, since the first scan selection signal SCAN[1] has an on-level voltage, the first sensing transistor ST1 may be turned on. In addition, the scan transistors SCT in the sub-pixels R, W, B, and G in the first pixel area PA1 may also be turned on.

[0264] Reference Fig.10 , during the display period DP, when the first sensing transistor ST1 is turned on, the first touch sensor TS1 and the first sensing line SL1 may be electrically connected through the first sensing transistor ST1.

[0265] The temperature sensing may be performed during the entire display period DP, but is not limited thereto. Alternatively, the temperature sensing may be performed during a portion of the display period DP.

[0266] Reference Fig.10 During the display period DP, a test signal SIG for temperature sensing may be provided to the first touch line TL1. For example, the test signal SIG may be a voltage having a constant first voltage level or a voltage having a variable voltage level.

[0267] Reference Fig.10 , when the test signal SIG is provided, no signal may be applied to the first sensing line SL1, or a voltage having a constant second voltage level may be applied to the first sensing line SL1. Here, the second voltage level may be different from the first voltage level.

[0268] During the display period DP, when the first sensing transistor ST1 is turned on, the first touch sensor TS1 and the first sensing line SL1 may be electrically connected. In addition, when the test signal SIG is applied to the first touch line TL1 connected to the first touch sensor TS1, current may flow to the first sensing line SL1. Here, a path through which the current flows may be formed by the first touch line TL1, the first touch bridge TB1, the first touch sensor TS1, the first sensing transistor ST1, and the first sensing line SL1.

[0269] Reference Fig.10 During the display period DP, the current sensing circuit TSC connected to the first sensing line SL1 may sense the current flowing in the first sensing line SL1. For example, the current sensing circuit TSC may include an analog-to-digital converter. The analog-to-digital converter may convert a voltage corresponding to the current flowing in the first sensing line SL1 into a digital value and output the digital value as a current sensing value, but is not limited thereto.

[0270] That is, during the display period DP, the first scan selection signal SCAN[1] may be provided to the first sensing transistor ST1, and the first sensing transistor ST1 may be turned on. During the period in which the first sensing transistor ST1 is turned on, the touch driving circuit 160 may provide the test signal SIG to the first touch line TL1, and the current sensing circuit TSC may sense the current flowing in the first sensing line SL1.

[0271] During the display period DP, the first scan selection signal SCAN[1] may be simultaneously provided to the gate nodes of the scan transistors SCT included in each of the sub-pixels R, W, B, and G in the first pixel region PA1 disposed within the first touch sensor unit region TSU1. Thus, the scan transistors SCT included in each of the sub-pixels R, W, B, and G may be turned on.

[0272] Therefore, during the display period DP, when current sensing is performed by the first sensing transistor ST1 within the first touch sensor unit region TSU1, display driving may be performed on the sub-pixels R, W, B, and G in the first pixel region PA1 disposed within the first touch sensor unit region TSU1. Here, the display driving may include providing the sub-pixels R, W, B, and G with data voltages Vdata for image display.

[0273] During the display period DP, as the temperature of the first touch sensor area TSA1 increases, the mobility of the first sensing transistor ST1 may also increase, and thus, the amount of current flowing in the first sensing line SL1 per unit time may increase.

[0274] During the display period DP, as the temperature of the first touch sensor area TSA1 decreases, the mobility of the first sensing transistor ST1 may decrease, and thus, the amount of current flowing in the first sensing line SL1 per unit time may decrease.

[0275] In order to improve the accuracy of temperature sensing, the first sensing transistor ST1 may be a transistor having a characteristic of large mobility change relative to temperature change. That is, the first sensing transistor ST1 may be a transistor having a characteristic change that is sensitive to temperature change. The temperature change in the first touch sensor unit region TSU1 may be detected by utilizing this characteristic.

[0276] For example, the first sensing transistor ST1 may be an oxide transistor whose active layer is composed of an oxide semiconductor material, but is not limited thereto.

[0277] During the display period DP, if a touch occurs by a finger in or around the first touch sensor area TSA1, or if a grayscale of an image displayed for the first pixel area PA1 increases, the amount of current flowing in the first sensing line SL1 may increase.

[0278] As the amount of current flowing in the first sensing line SL1 per unit time changes during the display period DP, a touch sensing value obtained during the touch period TP after the display period DP may change.

[0279] Fig.11 The first touch sensor unit region TSU1 during the touch period TP in the touch display device 100 according to the exemplary embodiment of the present disclosure is illustrated.

[0280] Reference Fig.11 , during the touch period TP for sensing a touch, the first scan strobe signal SCAN[1] may have a cut-off level voltage. Here, Fig.11 As shown, if the first sensing transistor ST1 is an n-type transistor, the off-level voltage of the first scan selection signal SCAN[1] may be a low-level voltage. If the first sensing transistor ST1 is a p-type transistor, the on-level voltage of the first scan selection signal SCAN[1] may be a high-level voltage.

[0281] Reference Fig.11During the touch period TP for sensing a touch, since the first scan selection signal SCAN[1] has a turn-off level voltage, the first sensing transistor ST1 may be turned off, and the scan transistors SCT included in the sub-pixels R, W, G, and B within the first pixel area PA1 may also be turned off.

[0282] Reference Fig.11 , during the touch period TP, when the first sensing transistor ST1 is turned off, the first touch sensor TS1 and the first sensing line SL1 may be electrically separated by the first sensing transistor ST1.

[0283] During the touch period TP, a touch driving signal TDS having a variable voltage level may be provided to the first touch line TL1.

[0284] During the touch period TP, the touch driving circuit 160 may provide the touch driving signal TDS to the first touch sensor TS1 through the first touch line TL1 .

[0285] During the touch period TP, since the first touch sensor TS1 is electrically separated from the first sensing line SL1 due to the turn-off of the first sensing transistor ST1 , the touch driving signal TDS provided to the first touch sensor TS1 is not transmitted to the first sensing line SL1 .

[0286] During the touch period TP, the touch driving circuit 160 may sense capacitance (eg, self-capacitance) in the first touch sensor TS1 through the first touch line TL1 after outputting the touch driving signal TDS to the first touch line TL1 .

[0287] During the touch period TP, since the first sensing transistor ST1 is in the off state, the first sensing line SL1 can be electrically separated from the first touch sensor TS1 and can be in an electrically floating state. Therefore, during the touch period TP, current does not flow to the first sensing line SL1. Therefore, the first sensing line SL1 does not affect touch sensing.

[0288] Fig.12 Two touch sensor unit regions TSU1 and TSU2 are illustrated during a display period DP in which temperature sensing is performed in the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0289] Reference Fig.12 , the touch display device 100 may include a plurality of touch sensor unit regions such as a first touch sensor unit region TSU1 and a second touch sensor unit region TSU2 , but is not limited thereto.

[0290] The first touch sensor unit area TSU1 may include a first pixel area PA1 and a first touch sensor area TSA1. The first sub-pixels R, W, B, and G may be disposed in the first pixel area PA1, and the first touch sensor TS1 may be disposed in the first touch sensor area TSA1. The first touch sensor area TSA1 may be located at one side of the first pixel area PA1. The first sub-pixels R, W, B, and G may be disposed as shown in FIG. Figure 2 Configuration shown.

[0291] The second touch sensor unit area TSU2 may include a second pixel area PA2 and a second touch sensor area TSA2. The second sub-pixels R, W, B, and G may be disposed in the second pixel area PA2, and the second touch sensor TS2 may be disposed in the second touch sensor area TSA2. The second touch sensor area TSA2 may be located at one side of the second pixel area PA2. The second sub-pixels R, W, B, and G may be disposed as shown in FIG. Figure 2 Configuration shown.

[0292] The second touch sensor unit area TSU2 may be adjacent to the first touch sensor unit area TSU1 in the column direction. The second pixel area PA2 may be adjacent to the first pixel area PA1 in the column direction. The second touch sensor area TSA2 may be adjacent to the first touch sensor area TSA1 in the column direction. The first pixel area PA1 may be adjacent to the first touch sensor area TSA1 in the row direction. The second pixel area PA2 may be adjacent to the second touch sensor area TSA2 in the row direction.

[0293] The first driving power line DVL, the second driving power line VSL, and the reference voltage line RVL may be disposed in a column direction. The first driving power line DVL, the second driving power line VSL, and the reference voltage line RVL may be arranged across the first touch sensor unit region TSU1 and the second touch sensor unit region TSU2.

[0294] The first scan gate line SCL1 and the second scan gate line SCL2 may be disposed in a row direction. The first scan gate line SCL1 may be disposed in the first touch sensor unit region TSU1, and the second scan gate line SCL2 may be disposed in the second touch sensor unit region TSU2.

[0295] The first scan gate line SCL1 may provide a first scan gate signal SCAN[1] to the scan transistors SCT in the first sub-pixels R, W, B, and G included in the first pixel region PA1 within the first touch sensor unit region TSU1. The scan transistors SCT in the first sub-pixels R, W, B, and G included in the first pixel region PA1 within the first touch sensor unit region TSU1 may be turned on or off in response to the first scan gate signal SCAN[1].

[0296] The second scan gate line SCL2 may provide a second scan gate signal SCAN[2] to the scan transistors SCT in the second sub-pixels R, W, B, and G included in the second pixel area PA2 in the second touch sensor unit area TSU2. The scan transistors SCT in the second sub-pixels R, W, B, and G included in the second pixel area PA2 in the second touch sensor unit area TSU2 may be turned on or off in response to the second scan gate signal SCAN[2].

[0297] The first touch lines TL1 and the first sensing lines SL1 may be arranged in a column direction.

[0298] In the first touch sensor unit region TSU1 , a first touch bridge TB1 connecting the first touch line TL1 and the first touch sensor TS1 may be disposed.

[0299] In the first touch sensor unit region TSU1 , a first resistance pattern R1 connected between the first touch sensor TS1 and the first touch bridge TB1 may be disposed.

[0300] In the second touch sensor unit region TSU2 , a second touch bridge TB2 connecting the first touch line TL1 and the second touch sensor TS2 may be disposed.

[0301] In the second touch sensor unit region TSU2 , a second resistance pattern R2 connected between the second touch sensor TS2 and the second touch bridge TB2 may be provided.

[0302] In the first touch sensor unit region TSU1 , a first sensing transistor ST1 controlling an electrical connection between the first sensing line SL1 and the first touch sensor TS1 may be disposed.

[0303] In the second touch sensor unit region TSU2 , a second sensing transistor ST2 that controls electrical connection between the first sensing line SL1 and the second touch sensor TS2 may be disposed.

[0304] During the display period DP, the test signal SIG may be provided to the first touch line TL1.

[0305] Fig.12Two touch sensor unit areas during a display period in which temperature sensing is performed in a touch display device according to an exemplary embodiment of the present disclosure are illustrated.

[0306] Reference Fig.12 , during the first time t1 included in the display period DP, the first scan select signal SCAN[1] may have an on-level voltage (eg, high), and the second scan select signal SCAN[2] may have an off-level voltage (eg, low).

[0307] Therefore, during the first time t1 , the first sensing transistor ST1 may be turned on in response to the first scan strobe signal SCAN[ 1 ], and the second sensing transistor ST2 may be turned off in response to the second scan strobe signal SCAN[ 2 ].

[0308] During the first time t1 , the current sensing circuit TSC may sense current flowing along the first current flow path, and may generate a current sensing value for the first touch sensor unit region TSU1 based on the current sensing result and provide the current sensing value to the touch controller 170 .

[0309] During the first time t1 , the touch controller 170 may compensate the touch sensing value based on the current sensing value of the first touch sensor unit region TSU1 .

[0310] Reference Fig.12 , the display period DP may include a first time t1 and a second time t2.

[0311] Reference Fig.12 During a second time t2 performed after the first time t1, the first scan select signal SCAN[1] may have an off-level voltage (eg, low), and the second scan select signal SCAN[2] may have an on-level voltage (eg, high).

[0312] Therefore, during the second time t2 , the first sensing transistor ST1 may be turned off in response to the first scan strobe signal SCAN[ 1 ], and the second sensing transistor ST2 may be turned on in response to the second scan strobe signal SCAN[ 2 ].

[0313] During the second time t2 , the current sensing circuit TSC may sense current, and may generate a current sensing value for the second touch sensor unit region TSU2 based on the current sensing result, and provide the current sensing value to the touch controller 170 .

[0314] During the second time t2 , the touch controller 170 may compensate the touch sensing value based on the current sensing value of the second touch sensor unit region TSU2 .

[0315] Fig.13 A structure for simultaneously performing temperature sensing for a plurality of touch sensors in the touch display device 100 according to an exemplary embodiment of the present disclosure is shown.

[0316] Reference Fig.13 , the touch display device 100 according to the exemplary embodiment of the present disclosure may perform current sensing for temperature sensing in a plurality of touch sensor unit regions TSU at the same time.

[0317] To this end, the touch display device 100 according to the exemplary embodiment of the present disclosure can sense the temperature of two or more touch sensor unit areas TSU simultaneously by grouping two or more sensing lines SL1, SL2, SL3, and SL4 into one sensing line group to sense the two or more sensing lines. This sensing method may be referred to as group sensing.

[0318] The group sensing structure of the touch display device 100 according to the exemplary embodiment of the present disclosure may include two or more group transistors GT1 , GT2 , GT3 , and GT4 , a group gate line GGL, and a group sensing line GSL.

[0319] Two or more grouping transistors GT1 , GT2 , GT3 , and GT4 may correspond to two or more sensing lines SL1 , SL2 , SL3 , and SL4 , respectively.

[0320] The group gate line GGL may be simultaneously connected to gate nodes of two or more group transistors GT1 , GT2 , GT3 , and GT4 .

[0321] Two or more group transistors GT1, GT2, GT3, and GT4 may be simultaneously turned on or off by a group scan signal GSCAN supplied from a group gate line GGL.

[0322] If two or more grouping transistors GT1, GT2, GT3, and GT4 are simultaneously turned on in response to a grouping scan signal GSCAN provided from a grouping gate line GGL, two or more sensing lines SL1, SL2, SL3, and SL4 may be simultaneously electrically connected to one grouping gate line GGL.

[0323] Currents flowing in two or more sensing lines SL1, SL2, SL3, and SL4 may be combined and flow to one group gate line GGL. Therefore, the current sensing circuit TSC may sense the sum of currents flowing to one group gate line GGL.

[0324] The current sensing value may correspond to temperatures of two or more touch sensor unit regions TSU corresponding to the two or more sensing lines SL1 , SL2 , SL3 , and SL4 .

[0325] When the contact area between the touch pointer (eg, finger, pen) and the display panel 110 is small, the above-mentioned group sensing may be a very effective and fast sensing method.

[0326] If two or more grouping transistors GT1, GT2, GT3, and GT4 are simultaneously turned off in response to a grouping scan signal GSCAN provided from a grouping gate line GGL, two or more sensing lines SL1, SL2, SL3, and SL4 may be simultaneously electrically separated from one grouping gate line GGL.

[0327] Two or more sensing lines SL1 , SL2 , SL3 , and SL4 may be electrically connected to one group sensing line GSL through two or more group transistors GT1 , GT2 , GT3 , and GT4 .

[0328] Fig.14 A compensation process for a touch sensitivity change due to a temperature change in the touch display device 100 according to an exemplary embodiment of the present disclosure is illustrated.

[0329] Fig.14 A graph showing a change in mobility of the first sensing transistor ST1 over time (hereinafter referred to as a mobility graph) and a graph showing a touch sensing value and a compensated touch sensing value over temperature (hereinafter referred to as a touch sensing value graph) are shown.

[0330] Reference Fig.14 , the mobility curve graphically represents the change of the mobility of the first sensing transistor ST1 over time for three temperatures T1, T2 and T3. Here, the third temperature T3 may be the highest temperature, and the first temperature T1 may be the lowest temperature. That is, the third temperature T3 is higher than the second temperature T2, and the second temperature T2 is higher than the first temperature T1.

[0331] Reference Fig.14 , at a specific time point, the higher the temperature, the higher the mobility. That is, when the temperature is the third temperature T3, the mobility of the first sensing transistor ST1 may have the maximum third mobility value, and the mobility of the first sensing transistor ST1 may have the minimum first mobility value at the first temperature T1. In addition, when there is a second temperature T2, the mobility of the first sensing transistor ST1 may have a second mobility value between the first mobility value and the third mobility value.

[0332] Therefore, the current sensing circuit TSC can obtain a maximum third current sensing value when the temperature is the third temperature T3, obtain a minimum first current sensing value when the temperature is the first temperature T1, and obtain a second current sensing value between the first current sensing value and the third current sensing value when the temperature is the second temperature T2.

[0333] In addition, for each of the first temperature T1, the second temperature T2, and the third temperature T3, the mobility of the first sensing transistor ST1 increases over time. That is, when the temperature is the third temperature T3, the mobility of the first sensing transistor ST1 increases over time, when the temperature is the second temperature T2, the mobility of the first sensing transistor ST1 increases over time, and when the temperature is the first temperature T1, the mobility of the first sensing transistor ST1 increases over time.

[0334] The touch display device 100 according to an exemplary embodiment of the present disclosure may include a memory for storing a lookup table having a compensation value corresponding to each current sensing value.

[0335] For example, when the touch controller 170 receives a first current sensing value from the current sensing circuit TSC and then receives a first touch sensing value TSEN from the touch driving circuit 160 during a touch period TP, the touch controller 170 can use the first current sensing value to change the first touch sensing value TSEN to generate a second touch sensing value COMP_TSEN.

[0336] The second touch sensing value COMP_TSEN may be a value obtained by subtracting the first compensation value COMP1 corresponding to the first current sensing value from the first touch sensing value TSEN (ie, COMP_TSEN=TSEN-COMP1). Here, the first compensation value COMP1 may be a compensation value extracted from a lookup table and may be a compensation value corresponding to the first current sensing value, but is not limited thereto. In addition, the first compensation value COMP1 may be a compensation value corresponding to the first temperature sensing value.

[0337] The touch controller 170 may extract the first compensation value COMP1 from the lookup table. The second touch sensing value COMP_TSEN may be a touch sensing value in which the temperature effect is removed from the first touch sensing value TSEN.

[0338] For another example, if the touch controller 170 receives a second current sensing value from the current sensing circuit TSC due to temperature sensing (e.g., current sensing) performed during the display period DP, and then receives a first touch sensing value TSEN from the touch driving circuit 160 during the touch period TP, the touch controller 170 can use the second current sensing value to change the first touch sensing value TSEN to generate a second touch sensing value COMP_TSEN.

[0339] The second touch sensing value COMP_TSEN may be a value obtained by subtracting the second compensation value COMP2 corresponding to the second current sensing value from the first touch sensing value TSEN (ie, COMP_TSEN=TSEN-COMP2). Here, the second compensation value COMP2 may be a compensation value extracted from a lookup table and may be a compensation value corresponding to the second current sensing value, but is not limited thereto. In addition, the second compensation value COMP2 may be a compensation value corresponding to the second temperature sensing value.

[0340] The touch controller 170 may extract the second compensation value COMP2 from the lookup table. The second touch sensing value COMP_TSEN may be a touch sensing value in which the temperature effect is removed from the first touch sensing value TSEN.

[0341] As another example, if the touch controller 170 receives a third current sensing value from the current sensing circuit TSC due to temperature sensing (e.g., current sensing) performed during the display period DP, and then, if the touch controller 170 receives a first touch sensing value TSEN from the touch driving circuit 160 during the touch period TP, the touch controller 170 can use the third current sensing value to change the first touch sensing value TSEN to generate a second touch sensing value COMP_TSEN.

[0342] The second touch sensing value COMP_TSEN may be a value obtained by subtracting the third compensation value COMP3 corresponding to the third current sensing value from the first touch sensing value TSEN (ie, COMP_TSEN=TSEN-COMP3). Here, the third compensation value COMP3 may be a compensation value extracted from a lookup table and may be a compensation value corresponding to the third current sensing value, but is not limited thereto. In addition, the third compensation value COMP3 may be a compensation value corresponding to the third temperature sensing value.

[0343] The higher the temperature sensing value corresponding to the current sensing value is, the larger the compensation value COMP is, and thus the difference between the first touch sensing value TSEN and the second touch sensing value COMP_TSEN may be larger.

[0344] The touch controller 170 may extract the third compensation value COMP3 from the lookup table. The second touch sensing value COMP_TSEN may be a touch sensing value in which the temperature effect is removed from the first touch sensing value TSEN.

[0345] As described above, the first driving method in which the first sensing line SL1 becomes the current sensing path has been described among the two driving methods. Hereinafter, the second driving method in which the first touch line TL1 becomes the current sensing path will be described. Hereinafter, the description of the same features as the first driving method will be omitted.

[0346] Fig.15 is a flowchart of a touch sensing method in the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0347] Reference Fig.15 The touch sensing method of the touch display device 100 according to the exemplary embodiment of the present disclosure may include a temperature sensing step S10, a touch sensing step S20, a temperature compensation step S30, and a touch occurrence or touch position determination step S40.

[0348] In the temperature sensing step S10, the current sensing circuit TSC or the touch driving circuit 160 of the touch display device 100 may sense the temperature of the area of ​​the first touch sensor TS1 to obtain a temperature sensing value, or sense the current passing through the first touch sensor TS1 to obtain a current sensing value as a temperature sensing value. Here, the current may vary according to the temperature. For example, in the temperature sensing step S10, temperature sensing is performed during the display period to obtain a temperature sensing value.

[0349] In the touch sensing step S20 , the touch driving circuit 160 of the touch display device 100 may acquire a first touch sensing value through the first touch sensor TS1 during the touch period TP.

[0350] In the temperature compensation step S30, the touch controller 170 of the touch display device 100 can compensate the temperature of the touch display device 100 by using the temperature sensing value corresponding to the current sensing value (see Fig.14 )Change the first touch sensing value to create a second touch sensing value).

[0351] In the touch occurrence or touch position determining step S40 , the touch controller 170 of the touch display device 100 may determine the touch occurrence or touch position based on the second touch sensing value.

[0352] Here, the second touch sensing value may be a value where the temperature effect is removed from the first touch sensing value. Therefore, determining whether there is a touch or not and / or a touch position according to the second touch sensing value may be an accurate touch sensing result.

[0353] The temperature of the area of ​​the first touch sensor TS1 may be the temperature of the first touch sensor TS1 or the surrounding temperature of the first touch sensor TS1 .

[0354] As the temperature associated with the first touch sensor TS1 increases, the amount of current flowing through the first touch sensor TS1 per unit time may increase.

[0355] The temperature sensing step S10 for obtaining the temperature sensing value may be performed during the display period DP. Next, while the temperature sensing step S10 for obtaining the temperature sensing value is performed, a data voltage for displaying an image may be supplied to the sub-pixel SP adjacent to the first touch sensor TS1.

[0356] The higher the temperature sensing value corresponding to the current sensing value is, the larger the compensation value COMP is, and thus the difference between the first touch sensing value TSEN and the second touch sensing value COMP_TSEN can be larger (see Fig.14 ).

[0357] In step S10, if a first current sensing value or a first temperature sensing value corresponding to the first temperature T1 is obtained, a first compensation value COMP1 corresponding to the first current sensing value or the first temperature sensing value may be determined by referring to a lookup table. Therefore, the second touch sensing value COMP_TSEN may be a value obtained by subtracting the first compensation value COMP1 corresponding to the first current sensing value or the first temperature sensing value from the first touch sensing value TSEN (ie, COMP_TSEN=TSN-COMP1). Here, the first compensation value COMP1 may be a value obtained by multiplying the first current sensing value or the first temperature sensing value by a first weight.

[0358] In step S10, if a second current sensing value or a second temperature sensing value corresponding to a second temperature T2 higher than the first temperature T1 is obtained, a second compensation value COMP2 corresponding to the second current sensing value or the second temperature sensing value may be determined by referring to a lookup table. Therefore, the second touch sensing value COMP_TSEN may be a value obtained by subtracting the second compensation value COMP2 corresponding to the second current sensing value or the second temperature sensing value from the first touch sensing value TSEN (i.e., COMP_TSEN=TSEN-COMP2). Here, the second compensation value COMP2 may be a value obtained by multiplying the second current sensing value or the second temperature sensing value by a second weight. Here, the second weight may be a value greater than the first weight, but is not limited thereto.

[0359] In step S10, if a third current sensing value or a third temperature sensing value corresponding to a third temperature T3 higher than the second temperature T2 is obtained, a third compensation value COMP3 corresponding to the third current sensing value or the third temperature sensing value may be determined by referring to a lookup table. Therefore, the second touch sensing value COMP_TSEN may be a value obtained by subtracting the third compensation value COMP3 corresponding to the third current sensing value or the third temperature sensing value from the first touch sensing value TSEN (i.e., COMP_TSEN=TSEN-COMP3). Here, the third compensation value COMP3 may be a value obtained by multiplying the third current sensing value or the third temperature sensing value by a third weight. Here, the third weight may be a value greater than the second weight, but is not limited thereto.

[0360] Fig.16A is a touch sensitivity curve graph for explaining a compensation process of a touch sensitivity change (ie, a change in a touch sensing value) according to a temperature change caused by a finger touch of the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0361] Reference Fig.16A When a finger touch occurs, the temperature of the finger is transferred to the display panel 110, which may cause a positive thermal drift phenomenon. The display panel 110 may change in temperature due to the finger touch. That is, if the temperature of the touch pointer is higher than the surface temperature of the display panel 110, the parasitic capacitance may increase due to the higher temperature of the touch pointer during the touch occurrence time.

[0362] Reference Fig.16A , a touch sensing value (ie, touch sensitivity) before performing a compensation process of a touch sensitivity variation according to an exemplary embodiment of the present disclosure will be described as follows.

[0363] The display panel 110 may have a temperature change due to the finger touch. The change amount of the touch sensing value due to the temperature change of the display panel 110 caused by the finger touch may include the change amount of the touch sensing value due to the finger touch (A) and the change amount of the touch sensing value due to the temperature of the finger (B).

[0364] The amount of change (A) in the touch sensing value due to the finger touch may be a normal part absolutely necessary for touch sensing, and may be a part occurring due to the finger capacitance Cfinger.

[0365] The change amount (B) of the touch sensing value due to the temperature of the finger may be an unwanted portion that may cause a decrease in touch sensitivity and may be a portion due to an increase ΔCp in parasitic capacitance caused by a positive thermal drift phenomenon during a finger touch period.

[0366] After the finger touch disappears, the touch sensing value decreases, but may not immediately drop to the level before the touch occurs, and may have a value higher than the touch threshold for a certain period of time. Here, the touch threshold may represent the minimum touch sensing value for determining that a touch has occurred.

[0367] Even if the finger touch disappears, if a touch sensing value higher than the touch threshold is obtained from the touch driving circuit 160 within a certain period of time (e.g., a ghost touch occurrence period), the touch controller 170 may mistakenly recognize that a touch has occurred. Such ghost touch recognition may be a factor that can significantly reduce touch sensitivity.

[0368] After performing the compensation process of the touch sensitivity variation according to the exemplary embodiment of the present disclosure, the touch sensing value (ie, touch sensitivity) may be as follows.

[0369] The touch sensing value TSEN generated by the touch driving circuit 160 based on the touch sensing result may be a value obtained by adding the change in the touch sensing value (A) caused by the touch of the finger to the change in the touch sensing value (B) caused by the temperature of the finger, and the compensation value COMP calculated by current sensing may correspond to the change in the touch sensing value (B) caused by the temperature of the finger.

[0370] The compensated touch sensing value COMP_TSEN may be a value calculated by subtracting the compensation value COMP from the touch sensing value TSEN (ie, COMP_TSEN=TSEN-COMP). Therefore, the compensated touch sensing value COMP_TSEN may include only the change amount (A) of the touch sensing value due to the finger touch, but not the change amount (B) of the touch sensing value due to the finger temperature.

[0371] The change in the touch sensing value (B) due to the finger temperature may be an unwanted part that may cause the touch sensitivity to deteriorate. Fig.16A As shown, after compensation, since the touch occurrence and / or the touch position is determined using the compensated touch sensing value COMP_TSEN from which the variation (B) of the touch sensing value according to the finger temperature is removed, the ghost touch may be eliminated.

[0372] In addition, the touch sensitivity may be reduced not only by finger touch but also by image change. Here, image change may mean a change in image grayscale. In an exemplary embodiment of the present disclosure, the image change may have an effect comparable to a temperature change of the display panel 110.

[0373] Fig. 16Bis a touch sensitivity curve graph for explaining a compensation process of a touch sensitivity change (ie, a change in a touch sensing value) according to a temperature change caused by an image change of the touch display device 100 according to an exemplary embodiment of the present disclosure.

[0374] Reference Fig. 16B , the touch sensitivity can be reduced not only by finger touch but also by image changes.

[0375] Reference Fig. 16B , a touch sensing value (ie, touch sensitivity) before performing a compensation process of a touch sensitivity variation according to an exemplary embodiment of the present disclosure may be as follows.

[0376] Reference Fig. 16B , even when the image changes, the phenomenon that the surface temperature of the display panel 110 increases due to the finger touch may similarly occur. That is, if the image changes, a positive thermal drift phenomenon may similarly occur. That is, even if no touch occurs, the touch sensing value may change due to the image change.

[0377] Reference Fig. 16B , the change amount of the touch sensing value due to the image change may be considered as the change amount (C) of the touch sensing value due to the temperature change of the display panel 110 corresponding to the image change.

[0378] For example, when changing from a low grayscale image (e.g., a black image) to a high grayscale image (e.g., a white image), even if a touch does not actually occur, a touch sensing value higher than the touch threshold may be obtained from the touch drive circuit 160. When changing from a high grayscale image (e.g., a white image) to a low grayscale image (e.g., a black image), the touch sensing value may not drop below the touch threshold immediately, but may drop below the touch threshold after a short period of time.

[0379] Reference Fig. 16B , even when a touch does not actually occur, if a touch sensing value higher than the touch threshold is obtained from the touch driving circuit 160 according to the image change, the touch controller 170 may recognize that a touch has occurred during a period in which the touch sensing value is higher than the touch threshold (e.g., a ghost touch occurrence period). Such ghost touch recognition may be a factor that may significantly reduce touch sensitivity.

[0380] After performing the compensation process of the touch sensitivity variation according to the exemplary embodiment of the present disclosure, the touch sensing value (ie, touch sensitivity) may be described as follows.

[0381] The touch sensing value TSEN generated by the touch driving circuit 160 according to the touch sensing result may be a value corresponding to the amount of change (C) in the touch sensing value caused by the temperature change corresponding to the image change. The compensation value COMP calculated by current sensing may correspond to the amount of change (C) in the touch sensing value caused by the temperature change corresponding to the image change.

[0382] The compensated touch sensing value COMP_TSEN may be a value calculated by subtracting the compensation value COMP from the touch sensing value TSEN (ie, COMP_TSEN=TSEN-COMP). Therefore, the compensated touch sensing value COMP_TSEN may not include a value corresponding to the amount of change (C) of the touch sensing value due to temperature change corresponding to the image change.

[0383] The change amount (C) of the touch sensing value caused by the temperature change corresponding to the image change may be an unnecessary part that may cause the touch sensitivity to deteriorate. Fig. 16B As shown, after compensation, the touch occurrence and / or touch position may be determined using the compensated touch sensing value COMP_TSEN from which the change amount (C) of the touch sensing value due to the temperature change corresponding to the image change is removed, thereby eliminating the ghost touch.

[0384] As mentioned above, Figure 7 As shown, in the touch display device 100 according to the exemplary embodiment of the present disclosure, a plurality of touch sensors TS may be electrically connected to form a single touch electrode TE.

[0385] Therefore, the touch display device 100 according to the exemplary embodiment of the present disclosure may include a plurality of touch bridges TB electrically connecting a plurality of touch sensors TS in a single touch electrode unit area TEU in which a single touch electrode TE is formed. Figure 7 , a single touch electrode unit area TEU formed with a single touch electrode TE may include touch sensors TS arranged in n rows and m columns.

[0386] In the touch display device 100 according to the exemplary embodiment of the present disclosure, a plurality of touch bridges TB may be disposed in parallel with a plurality of scan gate lines SCL.

[0387] The touch display device 100 according to the exemplary embodiment of the present disclosure may have a separate touch bridge structure in which each of a plurality of touch bridges TB is provided for each touch sensor row.

[0388] For example, one touch bridge TB may be provided for each scan gate line SCL. That is, the number of the touch bridges TB and the number of the scan gate lines SCL may be the same.

[0389] In this case, since the touch bridge TB is provided for each touch sensor row, many touch bridges TB may be provided on the display panel 110. As a result, parasitic capacitance may increase and a load may increase due to the many touch bridges TB.

[0390] In one embodiment, if Fig.17 As shown, the touch display device 100 may have a shared touch bridge structure for reducing parasitic capacitance and reducing load. Hereinafter, a shared touch bridge structure according to an exemplary embodiment of the present disclosure will be described.

[0391] The shared touch bridge structure may include at least one touch bridge arranged in a horizontal direction (also called a row direction or a horizontal direction) and at least one touch bridge (also called a sub-touch bridge or a vertical sub-touch bridge) arranged in a vertical direction (also called a column direction or a vertical direction).

[0392] Fig.17 FIG. 2 is a schematic diagram showing a touch sensor structure of a touch display device 100 according to an exemplary embodiment of the present disclosure.

[0393] Reference Fig.17 The touch display device 100 according to an exemplary embodiment of the present disclosure may include a first touch sensor TS1 disposed in the transmission area TA, a first touch line TL1 electrically connected to the first touch sensor TS1 and extending in a column direction, and a first touch bridge TB1 electrically connected to the first touch line TL1 through a corresponding contact hole CNT_TL1 and extending in a row direction.

[0394] Reference Fig.17 In addition to the first touch bridge TB1 extending in the row direction, the touch display device 100 according to the exemplary embodiment of the present disclosure may further include a first sub-touch bridge VTB1 extending in the column direction. For example, the first touch bridge TB1 may include a first protrusion PRT1.

[0395] Reference Fig.17 , the first sub touch bridge VTB1 may be electrically connected to the first touch bridge TB1 and the first touch sensor TS1.

[0396] For example, a portion of the first sub touch bridge VTB1 may be connected to the first touch bridge TB1 , and another portion of the first sub touch bridge VTB1 may be connected to the first touch sensor TS1 .

[0397] For another example, a portion of the first sub-touch bridge VTB1 may be connected to the first protrusion PRT1 of the first touch bridge TB1 through the corresponding contact hole CNT1B, and the first protrusion PRT1 of the first touch bridge TB1 may be connected to the first touch sensor TS1 through the corresponding contact hole CNT1S. For example, the first protrusion PRT1 may include a first portion extending in a column direction relative to the first touch bridge TB1. For another example, the first protrusion PRT1 may include a first portion extending in a column direction relative to the first touch bridge TB1 and a second portion extending from the first portion in a row direction.

[0398] Reference Fig.17 , the first touch sensor TS1 may be included in the transmissive area TA.

[0399] The first sub touch bridge VTB1 may not overlap the first touch sensor TS1 at all, or may not overlap the first touch sensor TS1 at all except a portion connected to the first touch sensor TS1.

[0400] Therefore, even if the first sub touch bridge VTB1 exists as the touch sensor structure, a reduction in transmittance of the transmission area TA where the first touch sensor TS1 is disposed may be reduced or minimized.

[0401] In addition, the first sub touch bridge VTB1 may not overlap the first electrode E1 disposed in the first pixel area PA1, so that coupling between the first electrode E1 and the touch bridge configuration (eg, TB1 and VTB1) related to display driving may be significantly reduced.

[0402] That is, the influence between display driving and touch driving can be significantly reduced by configuring the first sub touch bridge VTB1 as a touch bridge in the column direction. In particular, by configuring the first sub touch bridge VTB1 in the column direction, display-to-touch crosstalk (DTX) can be significantly reduced due to the touch bridge configuration.

[0403] Reference Fig.17 The touch display device 100 according to the exemplary embodiment of the present disclosure may further include a second touch sensor TS2 disposed in the transmission area TA. The second touch sensor TS2 may be adjacent to the first touch sensor TS1 in the column direction.

[0404] Reference Fig.17 The touch display device 100 according to an exemplary embodiment of the present disclosure may further include a dummy touch bridge DTBa, which crosses the first touch line TL1 and the first sub touch bridge VTB1, but is electrically separated from the first touch line TL1 and the first sub touch bridge VTB1, and is disposed parallel to the first touch bridge TB1.

[0405] Reference Fig.17 , the second protrusion pattern PRT2 can be connected to the first sub-touch bridge VTB1 through the corresponding contact hole CNT2B, and can be connected to the second touch sensor TS2 through the corresponding contact hole CNT2S. The second protrusion pattern PRT2 can electrically connect the second touch sensor TS2 and the first sub-touch bridge VTB1. The second protrusion pattern PRT2 can be set on the same layer as the dummy touch bridge DTBa, but is not limited to this. The second protrusion pattern PRT2 can exist in a state disconnected from the dummy touch bridge DTBa (for example, a disconnected state). For example, the second protrusion pattern PRT2 may include a first portion extending in a column direction relative to the first touch bridge TB1 and a second portion extending from the first portion in a row direction. Refer to Fig.17 , the dummy touch bridge DTBa may not exist in the touch sensor structure. However, if the dummy touch bridge DTBa does not exist, a difference in image quality may occur between an area where the touch bridge exists and an area where the touch bridge does not exist. For example, if the dummy touch bridge DTBa is not set, a phenomenon may occur in which a specific area (e.g., a specific horizontal area) within the screen looks strange.

[0406] According to the shared touch bridge structure of the touch display device 100 according to the exemplary embodiment of the present disclosure, a dummy touch bridge DTBa may be provided in a region where the touch bridge TB disappears, thereby preventing a phenomenon in which a specific region (eg, a specific horizontal region) within the screen looks strange.

[0407] Fig.18 One first touch sensor unit region TSU1 of the touch display device 100 according to an exemplary embodiment of the present disclosure is shown.

[0408] Reference Fig.18 , the first touch sensor unit area TSU1 may include a first pixel area PA1 in which at least one first sub-pixel SP is disposed and a first touch sensor area TSA1 in which the first touch sensor TS1 is disposed.

[0409] The first touch sensor area TSA1 may be located at one side of the first pixel area PA1, but is not limited thereto.

[0410] The first sub-pixel SP1 disposed in the first pixel region PA1 may include a light emitting device ED and a scanning transistor SCT, etc. In addition, the first sub-pixel SP1 disposed in the first pixel region PA1 may further include a driving transistor DRT and a capacitor Cst. The first sub-pixel SP1 may include a light emitting device ED and a scanning transistor SCT, etc. Figure 2 Configuration shown.

[0411] Reference Fig.18The touch display device 100 according to the exemplary embodiment of the present disclosure may further include a plurality of first display driving lines arranged to cross the first touch sensor unit region TSU1 in a column direction. The plurality of first display driving lines may be connected to the first sub-pixel SP1.

[0412] Reference Fig.18 The plurality of first display driving lines may include two or more of a first driving power line DVL for providing a first driving power signal EVDD to the first sub-pixel SP, a second driving power line VSL for providing a second driving power signal EVSS to the first sub-pixel SP, a reference voltage line RVL for providing a reference voltage to the first sub-pixel SP, and a data line DL for providing a data voltage Vdata to the first sub-pixel SP, but is not limited thereto.

[0413] Reference Fig.18 The touch display device 100 according to the exemplary embodiment of the present disclosure may further include a second driving power horizontal line CL_VSL arranged to cross the first touch sensor unit region TSU1 in the row direction. The second driving power horizontal line CL_VSL may be a wiring for providing a second driving power signal EVSS and may be electrically connected to the second driving power line VSL in the column direction.

[0414] Reference Fig.18 According to an exemplary embodiment of the present disclosure, the touch display device 100 may include: a first sub-pixel SP1, the first sub-pixel SP1 including a first light emitting device and a first scanning transistor; a first touch sensor TS1, the first touch sensor TS1 is adjacent to the first sub-pixel SP1 in the row direction, the first touch sensor TS1 is located at one side of the first pixel area PA1; a first touch line TL1, the first touch line TL1 is electrically connected to the first touch sensor TS1 and extends in the column direction; a first sensing line SL1, the first sensing line SL1 is disposed adjacent to the first touch line TL1 and extends in the column direction; a first sensing transistor ST1, the first sensing transistor ST1 controls the electrical connection between the first sensing line SL1 and the first touch sensor TS1; a first touch bridge TB1, the first touch bridge TB1 is electrically connected to the first touch line TL1 and extends in the row direction; and a sub-touch bridge VTB1, the sub-touch bridge VTB1 is electrically connected to the first touch bridge TB1 and the first touch sensor TS1, extends in the column direction, and is disposed between the first sub-pixel SP1 and the first touch sensor TS1. In addition, the first sub-pixel SP1 may further include a first driving transistor and a capacitor.

[0415] As an example, in order to improve the accuracy of temperature sensing, the first sensing transistor ST1 may be a transistor having a characteristic of large mobility change relative to temperature change. That is, the first sensing transistor ST1 may be a transistor having a characteristic change sensitive to temperature change, but is not limited thereto.

[0416] Reference Fig.18 , the connection between the first sub touch bridge VTB1 and the first touch sensor TS1 may be a type of resistance pattern R1.

[0417] The touch display device 100 according to the exemplary embodiment of the present disclosure may further include a first scan gate line SCL1 electrically connected to a gate node of the first scan transistor and a gate node of the first sensing transistor ST1 .

[0418] The first scan gate line SCL1 may be arranged parallel to the first touch bridge TB1 .

[0419] Reference Fig.18 According to the exemplary embodiment of the present disclosure, the touch display device 100 may further include a dummy touch bridge DTBa, which crosses the first touch line TL1 and the first sub-touch bridge VTB1 arranged in the column direction, but is electrically separated from the first touch line TL1 and the first sub-touch bridge VTB1, and is arranged in parallel with the first touch bridge TB1. By providing the dummy touch bridge DTBa in the area where the touch bridge TB disappears, a phenomenon in which a specific area (e.g., a specific horizontal area) within the screen looks strange can be prevented.

[0420] Reference Fig.18 , in the touch display device 100 according to the exemplary embodiment of the present disclosure, the first sub touch bridge VTB1 may not overlap with the first touch sensor TS1.

[0421] Fig.19 and Fig. 20 is a cross-sectional view of a touch display device 100 according to an exemplary embodiment of the present disclosure.

[0422] Reference Fig.19 and Fig. 20 The touch display device 100 according to an exemplary embodiment of the present disclosure may include a transistor (e.g., a driving transistor DRT) and a light-emitting device ED disposed on a substrate SUB, and may also include a touch sensor structure including a first touch sensor TS1, a first touch bridge TB1, and a first sub-touch bridge VTB1.

[0423] In addition, the touch display device 100 according to the exemplary embodiment of the present disclosure may include various insulating layer structures such as a buffer layer BUF, a gate insulating layer GI, an interlayer insulating layer ILD, a first insulating layer INS1, a second insulating layer INS2, and an overcoat layer OC, but is not limited thereto.

[0424] Reference Fig.19 and Fig. 20 In this specification, the interlayer insulating layer ILD, the first insulating layer INS1 and the second insulating layer INS2 may be collectively referred to as an insulating layer INS.

[0425] A light shielding layer LS may be disposed on the substrate SUB, the light shielding layer LS being the lowest metal layer, and a buffer layer BUF may be disposed on the light shielding layer LS. For example, the light shielding layer LS may be disposed on a portion of the substrate SUB, and the buffer layer BUF may be disposed on the light shielding layer LS and a portion of the substrate SUB.

[0426] An active layer ACT may be disposed on the buffer layer BUF, a gate insulating layer GI may be disposed on the active layer ACT, and a gate electrode G may be disposed on the gate insulating layer GI. For example, the active layer ACT may be disposed on a portion of the buffer layer BUF, and the gate insulating layer GI may be disposed on a portion of the active layer ACT.

[0427] An interlayer insulating layer ILD may be disposed on the gate electrode G.

[0428] Each of the source electrode S and the drain electrode D of the driving transistor DRT may be disposed on the interlayer insulating layer ILD and may be connected to a portion of the active layer ACT through a contact hole of the interlayer insulating layer ILD.

[0429] The first insulating layer INS1 may be disposed on the source electrode S and the drain electrode D of the driving transistor DRT, and the second insulating layer INS2 may be disposed on the first insulating layer INS1. For example, the first insulating layer INS1 may be disposed on the source electrode S, the drain electrode D, and the interlayer insulating layer ILD of the driving transistor DRT.

[0430] The overcoat layer OC may be disposed on the second insulating layer INS2, and the first electrode E1 may be disposed on the overcoat layer OC. For example, the first electrode E1 may be disposed on a portion of the overcoat layer OC. The bank BK may be disposed on a portion of the first electrode E1. For example, the bank BK may be disposed on a portion of the first electrode E1 and a portion of the overcoat layer OC.

[0431] The organic layer OML may be disposed on the first electrode E1. Here, the organic layer OML may include a light emitting layer and a common layer, and the light emitting layer may be disposed only in the light emitting region, and the common layer may be disposed not only in the light emitting region but also in the non-light emitting region.

[0432] The second electrode E2 may be disposed on the organic layer OML.

[0433] The portion where the first electrode E1 , the organic layer OML, and the second electrode E2 overlap may form a light emitting device ED.

[0434] Reference Fig.19 and Fig. 20 The touch display device 100 according to the exemplary embodiment of the present disclosure may include a substrate SUB, an insulating layer INS located on the substrate SUB, an overcoat layer OC located on the insulating layer INS, a first electrode E1 disposed on the overcoat layer OC in a first pixel region PA1 including a first sub-pixel SP1, an organic layer OML disposed on the first electrode E1 in the first pixel region PA1, and a second electrode E2 disposed on the organic layer OML in the first pixel region PA1, but is not limited thereto. In addition, the touch display device 100 according to the exemplary embodiment of the present disclosure may further include a buffer layer BUF on the light shielding layer LS, and the light shielding layer LS is disposed on the substrate SUB.

[0435] Reference Fig.19 and Fig. 20 , the overcoat layer OC may not be disposed in the region where the first touch sensor TS1 is disposed.

[0436] Reference Fig.19 and Fig. 20 , in the touch display device 100 according to the exemplary embodiment of the present disclosure, the first sub touch bridge VTB1 may not overlap with the first touch sensor TS1.

[0437] Reference Fig.19 and Fig. 20 The first touch sensor TS1 may include the same material as the second electrode E2, but is not limited thereto. The first touch sensor TS1 and the second electrode E2 may be disposed in the same layer, but is not limited thereto.

[0438] Reference Fig.19 and Fig. 20 The touch display device 100 according to an exemplary embodiment of the present disclosure may further include a separation insulating layer INS_SEP separated from the insulating layer INS between the first pixel area PA1 and the first touch sensor TS1 and a separation overcoat layer OC_SEP separated from the overcoat layer OC between the first pixel area PA1 and the first touch sensor TS1.

[0439] Reference Fig.19 and Fig. 20 , the separation insulating layer INS_SEP may include a separation interlayer insulating layer ILD_SEP separated from the interlayer insulating layer ILD, a first separation insulating layer INS1_SEP separated from the first insulating layer INS1, and a second separation insulating layer INS2_SEP separated from the second insulating layer INS2. For example, the first separation insulating layer INS1_SEP may be disposed on the separation interlayer insulating layer ILD_SEP, and the second separation insulating layer INS2_SEP may be disposed on the first separation insulating layer INS1_SEP.

[0440] The separation overcoat layer OC_SEP may be located on the separation insulating layer INS_SEP.

[0441] Reference Fig.19 and Fig. 20 , the separation insulating layer INS_SEP may have an undercut structure UC which is further recessed inward than the separation overcoat layer OC_SEP through an undercut process. Therefore, the bottom surface area (ie, rear surface area) of the separation overcoat layer OC_SEP may be greater than the top surface area of ​​the separation insulating layer INS_SEP.

[0442] Reference Fig.19 and Fig. 20 , the touch display device 100 according to the exemplary embodiment of the present disclosure may further include a separation organic layer OML_SEP on the separation overcoat layer OC_SEP and a separation dummy metal DMY_SEP on the separation organic layer OML_SEP.

[0443] Reference Fig.19 and Fig. 20 , in the area UCA between the overcoat layer OC and the separation overcoat layer OC_SEP, the separation organic layer OML_SEP may include the same organic material as the organic layer OML and may be disconnected from the organic layer OML.

[0444] The separation dummy metal DMY_SEP may include the same metal as the second electrode E2 . However, the separation dummy metal DMY_SEP may be disconnected from the second electrode E2 .

[0445] The separation dummy metal DMY_SEP may include the same metal as the first touch sensor TS1 in addition to the second electrode E2 , and may be disconnected from the first touch sensor TS1 .

[0446] The second electrode E2, the separation dummy metal DMY_SEP, and the first touch sensor TS1 may include the same common electrode material, but are not limited thereto. If the second electrode E2 is a cathode electrode, the common electrode material may be referred to as a cathode electrode material.

[0447] Since the overcoat layer OC and the separation overcoat layer OC_SEP are spaced apart from each other and an undercut structure UC can be formed in the separation insulating layer INS_SEP under the separation overcoat layer OC_SEP, when an organic material is deposited on the overcoat layer OC and the separation overcoat layer OC_SEP, the organic layer OML and the separation organic layer OML_SEP can be formed while being effectively separated.

[0448] In addition, since the overcoat layer OC and the separation overcoat layer OC_SEP are spaced apart, and an undercut structure UC can be formed in the separation insulating layer INS_SEP under the separation overcoat layer OC_SEP, when a common electrode material is deposited on the overcoat layer OC and the separation overcoat layer OC_SEP, the second electrode E2, the separation dummy metal DMY_SEP, and the first touch sensor TS1 can be formed by effective separation.

[0449] In addition, since the separation dummy metal DMY_SEP is disposed between the second electrode E2 and the first touch sensor TS1 , separation and electrical disconnection between the second electrode E2 and the first touch sensor TS1 may be more completely achieved.

[0450] Reference Fig.19 and Fig. 20 , the first sub touch bridge VTB1 may be disposed not to overlap with the region between the overcoat layer OC and the separation overcoat layer OC_SEP. Therefore, it is possible to prevent the transmittance of the transmission area TA from being reduced due to the first sub touch bridge VTB1.

[0451] Reference Fig.19 , the first sub touch bridge VTB1 may be disposed on the interlayer insulating layer ILD, and may include the same material as the source electrode S and the drain electrode D of the driving transistor DRT, but is not limited thereto.

[0452] Reference Fig.19 , the first sub touch bridge VTB1 may be connected to a portion of the first touch bridge TB1 through the contact holes of the interlayer insulating layer ILD and the buffer layer BUF.

[0453] Reference Fig.19 , the first touch sensor TS1 disposed in the transmission area TA may be disposed on the buffer layer BUF. The first touch bridge TB1 may be disposed between the substrate SUB and the buffer layer BUF. In addition, the light shielding layer LS may be disposed between the substrate SUB and the buffer layer BUF.

[0454] Reference Fig.19 The touch display device 100 may further include a touch connection pattern CP_TS connected to one end of the first touch bridge TB1.

[0455] Reference Fig.19, the touch connection pattern CP_TS may be disposed on the separation interlayer insulating layer ILD_SEP. For example, the touch connection pattern CP_TS may be disposed on a portion of the separation interlayer insulating layer ILD_SEP.

[0456] Reference Fig.19 , a portion of the touch connection pattern CP_TS may be connected to the first touch sensor TS1 , and another portion of the touch connection pattern CP_TS may be connected to the first touch bridge TB1 through the contact hole.

[0457] Reference Fig. 20 , the first sub touch bridge VTB1 may be disposed on the overcoat layer OC, and may include the same material as the first electrode E1, but is not limited thereto. For example, the first sub touch bridge VTB1 may be disposed on a portion of the overcoat layer OC.

[0458] Reference Fig. 20 , the first touch sensor TS1 disposed on the transmission area TA may be disposed on the buffer layer BUF. For example, the first touch sensor TS1 may be disposed on a portion of the buffer layer BUF. The first touch bridge TB1 may be disposed between the substrate SUB and the buffer layer BUF.

[0459] Reference Fig. 20 The first touch sub bridge VTB1 may be connected to the connection pattern CP_CTB on the interlayer insulating layer ILD through the contact holes of the overcoat layer OC, the second insulating layer INS2 and the first insulating layer INS1. The connection pattern CP_CTB may be connected to a portion of the first touch bridge TB1 through the contact holes of the interlayer insulating layer ILD and the buffer layer BUF.

[0460] Reference Fig. 20 , the touch display device 100 may further include a touch connection pattern CP_TS connected to one end of the first touch bridge TB1.

[0461] The touch connection pattern CP_TS may be disposed on the separation interlayer insulating layer ILD_SEP. For example, the touch connection pattern CP_TS may be disposed on a portion of the separation interlayer insulating layer ILD_SEP.

[0462] A portion of the touch connection pattern CP_TS may be connected to the first touch sensor TS1 , and another portion of the touch connection pattern CP_TS may be connected to the first touch bridge TB1 through the contact hole.

[0463] Fig.21 Two touch sensor unit regions TSU1 and TSU2 of the touch display device 100 according to an exemplary embodiment of the present disclosure are shown.

[0464] refer to Fig.21, the touch display device 100 may include a plurality of touch sensor unit regions, for example, a first touch sensor unit region TSU1 and a second touch sensor unit region TSU2 , but is not limited thereto.

[0465] Reference Fig.21 , the first sub touch bridge VTB1 may be connected to the first touch sensors TS1 disposed in the first touch sensor area TSA1, and may be connected to the second touch sensors TS2 disposed in the second touch sensor area TSA2.

[0466] Reference Fig.21 , the first touch bridge TB1 may be disposed at the bottom of the first touch sensor TS1 (ie, between the first touch sensor TS1 and the second touch sensor TS2), and the dummy touch bridge DTBa may be disposed at the bottom of the second touch sensor TS2 instead of the bottom of the touch bridge. Fig.21 , the first touch sensor area TSA1 may be located at one side of the first pixel area PA1, and the second touch sensor area TSA2 may be located at one side of the second pixel area PA2.

[0467] Reference Fig.21 , the first touch bridge TB1 may be electrically connected to the first sub touch bridge VTB1, the first touch sensor TS1, and the first touch line TL1, but the dummy touch bridge DTBa may not be electrically connected to the first sub touch bridge VTB1, the first touch sensor TS1, and the first touch line TL1.

[0468] Reference Fig.21 , a connection between the first sub touch bridge VTB1 and the first touch sensor TS1 may be defined as a first resistance pattern R1, and a connection between the first sub touch bridge VTB1 and the second touch sensor TS2 may be defined as a second resistance pattern R2.

[0469] Reference Fig.21 , the second driving power horizontal line CL_VSL may be arranged parallel to the first scan gate line SCL1 and the first touch bridge TB1 at the bottom of the first touch sensor TS1. Another second driving power horizontal line CL_VSL may be arranged parallel to the second scan gate line SCL2 and the dummy touch bridge DTBa at the bottom of the second touch sensor TS2.

[0470] Fig. 22 A driving synchronization between the first sub touch bridge VTB1 and the first touch sensor TS1 is shown.

[0471] During the touch period TP, the touch driving circuit 160 may output a touch driving signal TDS having a variable voltage level to the first touch line TL1 .

[0472] The touch driving signal TDS applied to the first touch line TL1 may be provided to the first touch sensor TS1 through the first touch bridge TB1 and the first sub touch bridge VTB1 electrically connected to the first touch line TL1 .

[0473] The amplitude ΔV2 of the signal applied to the first sub touch bridge VTB1 may be the same as or similar to the amplitude ΔV1 of the touch driving signal TDS applied to the first touch sensor TS1 within a predetermined range.

[0474] Therefore, even if there is a point where the first touch sub bridge VTB1 or the first touch bridge TB1 slightly overlaps the first touch sensor TS1, a potential difference may not be caused. Therefore, formation of parasitic capacitance between the first touch sub bridge VTB1 or the first touch bridge TB1 and the first touch sensor TS1 may be prevented or reduced.

[0475] Fig.23 is a plan view schematically showing the first touch electrode unit region TEU1 including a plurality of sub touch bridges VTB1 to VTB4 .

[0476] However, Fig.23 Only components driven for touch sensing during the touch period TP are shown. Fig.23 , components driven for touch sensing during the touch period TP may include a first touch line TL1 , a first touch bridge TB1 , a second touch bridge TB2 , and a touch sensor included in the first touch electrode unit area TEU1 .

[0477] For example, the first touch electrode unit area TEU1 may include a plurality of touch sensor rows and a plurality of touch sensor columns. Fig.23 In the example of , the first touch electrode unit area TEU1 may be an area in which the first touch sensors TS1 are disposed, and the number of touch sensor rows is four, and the number of touch sensor columns is also four, but is not limited thereto. More or fewer touch sensor rows and touch sensor columns are possible.

[0478] Reference Fig.23, for example, the first touch electrode unit area TEU1 may include sixteen touch sensor unit areas TSU1-1, TSU1-2, TSU1-3, TSU1-4, TSU2-1, TSU2-2, TSU2-3, TSU2-4, TSU3-1, TSU3-2, TSU3-3, TSU3-4, TSU4-1, TSU4-2, TSU4-3 and TSU4-4. Here, the sixteen touch sensor unit areas TSU1-1, TSU1-2, TSU1-3, TSU1-4, TSU2-1, TSU2-2, TSU2-3, TSU2-4, TSU3-1, TSU3-2, TSU3-3, TSU3-4, TSU4-1, TSU4-2, TSU4-3 and TSU4-4 may be arranged in four rows and four columns. However, in Fig.23 In the figure, for convenience of explanation, sixteen pixel regions included in sixteen touch sensor unit regions (TSU1-1, TSU1-2, TSU1-3, TSU1-4, TSU2-1, TSU2-2, TSU2-3, TSU2-4, TSU3-1, TSU3-2, TSU3-3, TSU3-4, TSU4-1, TSU4-2, TSU4-3 and TSU4-4) are omitted. Fig.23 In the figure, for the convenience of explanation, the sixteen pixel areas included in the sixteen touch sensor unit areas TSU1-1, TSU1-2, TSU1-3, TSU1-4, TSU2-1, TSU2-2, TSU2-3, TSU2-4, TSU3-1, TSU3-2, TSU3-3, TSU3-4, TSU4-1, TSU4-2, TSU4-3 and TSU4-4 are also omitted.

[0479] For example, touch sensor unit areas TSU1-1, TSU1-2, TSU1-3, and TSU1-4 may be arranged on a first row, touch sensor unit areas TSU2-1, TSU2-2, TSU2-3, and TSU2-4 may be arranged on a second row, touch sensor unit areas TSU3-1, TSU3-2, TSU3-3, and TSU3-4 may be arranged on a third row, and touch sensor unit areas TSU4-1, TSU4-2, TSU4-3, and TSU4-4 may be arranged on a fourth row.

[0480] Reference Fig.23, sixteen touch sensors TS1-1, TS1-2, TS1-3, TS1-4, TS2-1, TS2-2, TS2-3, TS2-4, TS3-1, TS3-2, TS3-3, TS3-4, TS4-1, TS4-2, TS4-3 and TS4-4 can be respectively set in sixteen touch sensor unit areas TSU1-1, TSU1-2, TSU1-3, TSU1-4, TSU2-1, TSU2-2, TSU2-3, TSU2-4, TSU3-1, TSU3-2, TSU3-3, TSU3-4, TSU4-1, TSU4-2, TSU4-3 and TSU4-4.

[0481] Reference Fig.23 , sixteen touch sensors TS1-1, TS1-2, TS1-3, TS1-4, TS2-1, TS2-2, TS2-3, TS2-4, TS3-1, TS3-2, TS3-3, TS3-4, TS4-1, TS4-2, TS4-3 and TS4-4 can be electrically connected through the first touch bridge TB1 and the second touch bridge TB2 and the first sub touch bridge VTB1 to the fourth sub touch bridge VTB4 to form one first touch electrode TE1.

[0482] Reference Fig.23 , a plurality of touch lines TL1 , TL2 , TL3 , and TL4 may pass through the first touch electrode unit area TEU1 .

[0483] Among the plurality of touch lines TL1, TL2, TL3, and TL4, the first touch line TL1 may be electrically connected to the first touch electrode TE1, and the second touch line TL2, the third touch line TL3, and the fourth touch line TL4 may be touch lines that are not electrically connected to the first touch electrode TE1 and are bypassed. That is, the first touch line TL1 may be electrically connected to the sixteen touch sensors TS1-1, TS1-2, TS1-3, TS1-4, TS2-1, TS2-2, TS2-3, TS2-4, TS3-1, TS3-2, TS3-3, TS3-4, TS4-1, TS4-2, TS4-3, and TS4-4 constituting the first touch electrode TE1.

[0484] Reference Fig.23 , in the first touch electrode unit area TEU1, the first sub touch bridge VTB1 can be set to correspond to the first touch sensor row, the second sub touch bridge VTB2 can be arranged to correspond to the second touch sensor row, the third sub touch bridge VTB3 can be arranged to correspond to the third touch sensor row, and the fourth sub touch bridge VTB4 can be arranged to correspond to the fourth touch sensor row.

[0485] Reference Fig.23, in the first touch electrode unit area TEU1, the first touch bridge TB1 may be arranged to correspond to the first touch sensor row, and the second touch bridge TB2 may be arranged to correspond to the fourth touch sensor row.

[0486] Reference Fig.23 , in the first touch electrode unit area TEU1, the first dummy touch bridge DTBa may be arranged to correspond to the second touch sensor row, and the second dummy touch bridge DTBb may be arranged to correspond to the third touch sensor row.

[0487] Reference Fig.23 , the first to fourth sub touch bridges VTB1 to VTB4 may cross the first and second dummy touch bridges DTBa and DTBb.

[0488] However, the first to fourth sub touch bridges VTB1 to VTB4 may be electrically separated from the first and second dummy touch bridges DTBa and DTBb.

[0489] According to the exemplary embodiments of the present disclosure described above, a touch display device 100 and a touch sensing method capable of eliminating a ghost touch may be provided.

[0490] The exemplary embodiments of the present disclosure described above are briefly described below.

[0491] A touch display device according to an exemplary embodiment of the present disclosure may include: a first sub-pixel, the first sub-pixel having a first light-emitting device and a first scanning transistor; a first touch sensor, the first touch sensor being adjacent to the first sub-pixel in a row direction; a first touch line, the first touch line being electrically connected to the first touch sensor and extending in a column direction; a first sensing line, the first sensing line being arranged to be adjacent to the first touch line and extending in the column direction; a first sensing transistor, the first sensing transistor controlling the electrical connection between the first sensing line and the first touch sensor; a first touch bridge, the first touch bridge being electrically connected to the first touch line and extending in the row direction; and a first sub-touch bridge, the first sub-touch bridge being electrically connected to the first touch bridge and the first touch sensor, extending in the column direction, and arranged between the first sub-pixel and the first touch sensor.

[0492] The touch display device according to the exemplary embodiment of the present disclosure may further include a first scan gate line electrically connected to a gate node of the first scan transistor and a gate node of the first sensing transistor.

[0493] In the touch display device according to the exemplary embodiment of the present disclosure, when the first scanning transistor is turned on, the first sensing transistor is also turned on, so that the first touch sensor and the first sensing line are electrically connected.

[0494] In the touch display device according to the exemplary embodiment of the present disclosure, when the first scanning transistor is turned off, the first sensing transistor is also turned off, so that the first touch sensor and the first sensing line are electrically separated.

[0495] According to an exemplary embodiment of the present disclosure, the touch display device may further include: a second sub-pixel, which is adjacent to the first sub-pixel in the column direction and includes a second light-emitting device and a second scanning transistor; a second touch sensor, which is adjacent to the second sub-pixel in the row direction; and a second sensing transistor, which controls the electrical connection between the first sensing line and the second touch sensor.

[0496] The touch display device according to the exemplary embodiment of the present disclosure may further include a second scan gate line electrically connected to a gate node of the second scan transistor and a gate node of the second sensing transistor.

[0497] The touch display device according to an exemplary embodiment of the present disclosure may further include a dummy touch bridge crossing the first touch line and the first sub touch bridge while being electrically separated from the first touch line and the first sub touch bridge and disposed in parallel with the first touch bridge.

[0498] In the touch display device according to the exemplary embodiment of the present disclosure, the first sub touch bridge may not overlap with the first touch sensor, and thus the transmittance of the transmission area (also referred to as the transparent area) where the first touch sensor is disposed may be increased.

[0499] In the touch display device according to the exemplary embodiment of the present disclosure, the first sub touch bridge may not overlap the first touch sensor except for a portion connected to the first touch sensor.

[0500] In the touch display device according to the exemplary embodiment of the present disclosure, the first sub-touch bridge may not overlap with the first electrode included in the first light emitting device. Therefore, the coupling between the touch bridge structure and the first electrode (e.g., the anode electrode) can be reduced, which can reduce the load and also reduce the display to touch crosstalk (DTX).

[0501] According to an exemplary embodiment of the present disclosure, a touch display device may further include a substrate, an insulating layer located on the substrate, an outer coating layer located on the insulating layer, a first electrode disposed on the outer coating layer in a first pixel region including a first sub-pixel, an organic layer disposed on the first electrode in the first pixel region, and a second electrode disposed on the organic layer in the first pixel region.

[0502] The overcoat layer may not be provided in the region where the first touch sensor is provided.

[0503] The first touch sensor may include the same material as the second electrode.

[0504] The touch display device according to the exemplary embodiment of the present disclosure may further include a separation insulating layer separated from the insulating layer between the first pixel region and the first touch sensor, and a separation overcoat layer separated from the overcoat layer between the first pixel region and the first touch sensor.

[0505] A separate outer coating may be located on the separate insulating layer.

[0506] A lower surface of the separated outer coating layer may have a larger area than an upper surface of the separated insulating layer.

[0507] The touch display device according to the exemplary embodiment of the present disclosure may further include: a separation organic layer on the separation overcoat layer and a separation dummy metal on the separation organic layer.

[0508] In a region between the overcoat layer and the separation overcoat layer, the separation organic layer may include the same organic material as the organic layer and may be disconnected from the organic layer, and the separation dummy metal may include the same metal as the second electrode and may be disconnected from the second electrode.

[0509] The first sub touch bridge may be disposed not to overlap a region between the overcoat layer and the separation overcoat layer.

[0510] If the first sensing transistor is turned off, a signal having a variable voltage level may be provided to the first touch line, the first touch bridge, the first sub touch bridge, and the first touch sensor.

[0511] In the touch display device according to the exemplary embodiment of the present disclosure, the first touch sensor may be included in a transmission area allowing light to pass therethrough.

[0512] The touch display device according to the exemplary embodiment of the present disclosure may further include a first display driving line connected to the first sub-pixel.

[0513] The first display driving line may be disposed in a column direction while passing between the first sub-pixel and the first touch sensor.

[0514] The touch display device according to the exemplary embodiment of the present disclosure may further include an organic layer included in the first light emitting device or disposed on an upper portion or a lower portion of the first light emitting device.

[0515] The display period may include a first period in which a first data voltage for displaying an image is supplied to the first sub-pixel.

[0516] During the first period, the first sensing transistor may be turned on together with the first scanning transistor.

[0517] During a touch period different from a display period, the first sensing transistor may be turned off.

[0518] During the first period, the second sensing transistor may be turned off together with the second scanning transistor.

[0519] In the touch display device according to an exemplary embodiment of the present disclosure, the display period may further include a second period performed after the first period, during which the first sensing transistor may be turned off together with the first scanning transistor, and the second sensing transistor may be turned on together with the second scanning transistor.

[0520] During a first period of the display period, the first touch sensor and the first sensing line may be electrically connected, a test signal may be provided to the first touch line, and a current may flow to the first sensing line.

[0521] A touch display device according to an exemplary embodiment of the present disclosure may include a first touch sensor arranged in a transparent area, a first touch line electrically connected to the first touch sensor and extending in a column direction, a first touch bridge electrically connected to the first touch line and extending in a row direction, and a first sub-touch bridge electrically connected to the first touch bridge and the first touch sensor, extending in the column direction and not overlapping with the first touch sensor.

[0522] According to an exemplary embodiment of the present disclosure, a touch display device may further include a substrate, an insulating layer located on the substrate, an outer coating layer located on the insulating layer, a first electrode disposed on the outer coating layer in a first pixel region including a first sub-pixel, an organic layer disposed on the first electrode in the first pixel region, and a second electrode disposed on the organic layer in the first pixel region.

[0523] The overcoat layer may not be provided in the region where the first touch sensor is provided.

[0524] The touch display device according to the exemplary embodiment of the present disclosure may further include a separation insulating layer separated from the insulating layer between the first pixel region and the first touch sensor, and a separation overcoat layer separated from the overcoat layer between the first pixel region and the first touch sensor.

[0525] A separate outer coating may be located on the separate insulating layer.

[0526] A lower portion of the separated outer coating layer may be larger than an upper portion of the separated insulating layer.

[0527] A separate outer coating may be located on the separate insulating layer.

[0528] A lower surface region or a rear surface region of the separation outer coating layer may have a larger area than an upper surface or a top surface of the separation insulating layer.

[0529] The first sub-touch bridge may be set not to overlap with the region between the outer coating and the separated outer coating.

[0530] A touch sensing method according to an exemplary embodiment of the present disclosure may include: a temperature sensing step of sensing the temperature of the region of the first touch sensor during a display period to obtain a temperature sensing value, or sensing a current passing through the first touch sensor to obtain a current sensing value as the temperature sensing value; a touch sensing step of obtaining a first touch sensing value through the first touch sensor during a touch period; a temperature compensation step of creating a second touch sensing value by changing the first touch sensing value based on the temperature sensing value; and a touch occurrence or touch position determination step of determining a touch occurrence or touch position according to the second touch sensing value.

[0531] According to an exemplary embodiment of the present disclosure, a touch display device having a touch bridge structure capable of preventing a decrease in transmittance may be provided.

[0532] According to an exemplary embodiment of the present disclosure, a touch display device having a touch bridge structure capable of reducing display-to-touch crosstalk (DTX) may be provided.

[0533] According to an exemplary embodiment of the present disclosure, a touch display device having a touch sensor structure capable of reducing parasitic capacitance and load may be provided.

[0534] According to an exemplary embodiment of the present disclosure, a touch display device capable of eliminating ghost touches may be provided.

[0535] According to an exemplary embodiment of the present disclosure, a touch display device in which a temperature sensor structure and a touch sensor structure are combined may be provided.

[0536] According to an exemplary embodiment of the present disclosure, a touch display device capable of compensating a touch sensing value by sensing a current reflecting temperature may be provided.

[0537] According to an exemplary embodiment of the present disclosure, a touch display device having a dummy touch bridge structure capable of preventing a specific region (e.g., a specific horizontal region) within the screen from looking strange may be provided.

[0538] The above description and the drawings provide examples of the technical concept of the present disclosure for illustrative purposes only. Various modifications, additions, and substitutions to the described embodiments will be apparent to those skilled in the art without departing from the spirit and scope of the present disclosure. Additionally, the disclosed embodiments are intended to illustrate the scope of the technical concept of the present disclosure. Therefore, the scope of the present disclosure is not limited to the illustrated embodiments.

[0539] Cross - reference to related applications

[0540] This application claims the priority and benefit of Korean Patent Application No. 10 - 2023 - 0164317, filed on November 23, 2023, which is hereby incorporated by reference in its entirety for all purposes as if fully set forth herein.

Claims

1. A touch display device, comprising: a first sub-pixel having a first light emitting device and a first scanning transistor; a first touch sensor, the first touch sensor being adjacent to the first sub-pixel in a row direction; a first touch wire electrically connected to the first touch sensor and extending in a column direction; a first sensing line, the first sensing line being disposed adjacent to the first touch line and extending in the column direction; a first sensing transistor, the first sensing transistor controlling an electrical connection between the first sensing line and the first touch sensor; a first touch bridge electrically connected to the first touch line and extending in the row direction; as well as A first sub touch bridge is electrically connected to the first touch bridge and the first touch sensor, extends in the column direction, and is disposed between the first sub pixel and the first touch sensor. 2 . The touch display device according to claim 1 , further comprising a first scan gate line electrically connected to a gate node of the first scan transistor and a gate node of the first sensing transistor.

3. The touch display device according to claim 1, further comprising: a second sub-pixel, the second sub-pixel being adjacent to the first sub-pixel in the column direction and comprising a second light emitting device and a second scanning transistor; a second touch sensor, the second touch sensor being adjacent to the second sub-pixel in the row direction; as well as A second sensing transistor controls an electrical connection between the first sensing line and the second touch sensor. 4 . The touch display device according to claim 3 , further comprising a second scan gate line electrically connected to a gate node of the second scan transistor and a gate node of the second sensing transistor.

5. The touch display device according to claim 3, further comprising a dummy touch bridge that crosses the first touch line and the first touch sub-bridge and is electrically separated from the first touch line and the first touch sub-bridge and is arranged parallel to the first touch bridge.

6. The touch display device according to claim 1, wherein: The first sub touch bridge does not overlap the first touch sensor.

7. The touch display device according to claim 1, wherein: The first sub touch bridge does not overlap with a first electrode included in the first light emitting device.

8. The touch display device according to claim 1, further comprising: substrate; an insulating layer located on the substrate; an outer coating layer on the insulating layer; a first electrode disposed on the overcoat layer in a first pixel region including the first subpixel; an organic layer disposed on the first electrode in the first pixel region; as well as a second electrode disposed on the organic layer in the first pixel region, wherein the first touch sensor comprises the same material as the second electrode, The outer coating layer is not disposed in a region where the first touch sensor is disposed.

9. The touch display device according to claim 8, further comprising: a separation insulating layer separated from the insulating layer between the first pixel region and the first touch sensor; as well as a separated overcoat layer separated from the overcoat layer between the first pixel region and the first touch sensor, The separation outer coating is located on the separation insulating layer, and a lower surface of the separation outer coating has an area greater than an upper surface of the separation insulating layer.

10. The touch display device according to claim 9, further comprising: a separation organic layer disposed on the separation outer coating layer; as well as a separation dummy metal located on the separation organic layer, Wherein, in a region between the outer coating and the separation outer coating, the separation organic layer includes the same organic material as the organic layer and is disconnected from the organic layer, and the separation dummy metal includes the same metal as the second electrode and is disconnected from the second electrode.

11. The touch display device according to claim 9, wherein: The first sub touch bridge is disposed not to overlap a region between the overcoat layer and the separation overcoat layer.

12. The touch display device according to claim 1, wherein: The first touch sensor is included in a transmission area allowing light to pass therethrough.

13. The touch display device according to claim 1, further comprising a first display driving line connected to the first sub-pixel, in, The first display driving line is arranged in the column direction while passing between the first sub-pixel and the first touch sensor. 14 . The touch display device according to claim 1 , further comprising an organic layer included in the first light emitting device or disposed on an upper portion or a lower portion of the first light emitting device.

15. The touch display device according to claim 1, wherein: The display period includes a first period in which a first data voltage for displaying an image is provided to the first sub-pixel. wherein, during the first period, the first sensing transistor is turned on together with the first scanning transistor, During a touch period different from the display period, the first sensing transistor is turned off.

16. The touch display device according to claim 15, wherein: During the first period of the display period, the first touch sensor is electrically connected to the first sensing line, a test signal is provided to the first touch line, and a current flows to the first sensing line.

17. A touch display device, comprising: a first touch sensor, the first touch sensor being disposed in the transparent area; a first touch wire electrically connected to the first touch sensor and extending in a column direction; a first touch bridge, the first touch bridge being electrically connected to the first touch line and extending in a row direction; A first sub touch bridge is electrically connected to the first touch bridge and the first touch sensor, extends in the column direction, and does not overlap with the first touch sensor.

18. The touch display device according to claim 17, further comprising: substrate; an insulating layer located on the substrate; an outer coating layer on the insulating layer; a first electrode disposed on the overcoat layer in a first pixel region including a first subpixel; an organic layer disposed on the first electrode in the first pixel region; as well as a second electrode disposed on the organic layer in the first pixel region, The outer coating layer is not disposed in a region where the first touch sensor is disposed.

19. The touch display device according to claim 18, further comprising: a separation insulating layer separated from the insulating layer between the first pixel region and the first touch sensor; as well as a separated overcoat layer separated from the overcoat layer between the first pixel region and the first touch sensor, wherein the separation outer coating is located on the separation insulating layer, Wherein, the rear surface area of ​​the separation outer coating is larger than the upper surface area of ​​the separation insulating layer.

20. A touch sensing method, the touch sensing method comprising the following steps: a temperature sensing step for sensing a temperature of a region of the first touch sensor during a display period to obtain a temperature sensing value, or sensing a current passing through the first touch sensor to obtain a current sensing value as the temperature sensing value; a touch sensing step for acquiring a first touch sensing value through the first touch sensor during a touch period; a temperature compensation step for creating a second touch sensing value by changing the first touch sensing value based on the temperature sensing value; as well as A touch occurrence or touch position determination step is used to determine the touch occurrence or touch position based on the second touch sensing value.

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